Build sharp eyes, learn the why, and walk into contest day ready. A field lab made for the Grey Middle FFA team.
Two contest tracks, one team. Pick a quick lesson or build a listening playlist.
Identify trees through real features, comparisons, and the full specimen list.
Practice tree biology, forest management, measurements, soils, and fire.
Study fruit, leaves, rootstocks, pests, and citrus health clues.
Take a scored mock, review every explanation, then try again.
How to study like a field naturalist
Short explanations first. Listen to one card or play the full lesson path.
Xylem carries water and dissolved minerals upward from the roots. Phloem carries sugars made in the leaves to the parts of the tree that need them. The cambium is a thin growing layer that makes new xylem and phloem.
Memory cue: Say it twice: xylem = water up; phloem = food flow; cambium = new growth.
Photosynthesis uses light energy to make sugars. Stomata are tiny leaf openings involved in gas exchange. Transpiration is water vapor leaving a plant, mostly through its leaves. When stomata close, transpiration is reduced.
Memory cue: Think of stomata as adjustable doors: they help exchange gases and release water vapor.
DBH means diameter at breast height and is normally measured 4.5 feet above ground. A standard cord is a stack 4 feet high, 4 feet wide, and 8 feet long: 128 cubic feet. Board feet = thickness in inches × width in inches × length in feet ÷ 12. Basal area is the cross-sectional area of stems, usually measured at DBH.
Memory cue: For board feet, write T × W × L ÷ 12 before calculating. One acre contains 43,560 square feet.
A stand is a group of trees similar enough to manage as a unit. Thinning removes selected trees to reduce competition. A seed-tree method leaves some mature trees to provide seed; selection removes individual trees or small groups over time. A dominant crown rises above the canopy; a suppressed crown gets little direct light.
Memory cue: If a question says “same age,” look for even-aged. Several age classes point to uneven-aged.
From largest to smallest, the main soil particles are sand, silt, and clay. A pH of 7 is neutral. A watershed drains toward a common outlet. Streamside Management Zones help protect water quality. The fire triangle is heat, fuel, and oxygen. Prescribed fire can reduce built-up fuels and maintain fire-adapted ecosystems when planned and conducted by trained professionals.
Memory cue: Sand → silt → clay gets smaller. Fire needs all three: heat + fuel + oxygen.
Site index estimates how productive a site is for a particular tree species. It is commonly based on the age and height of dominant or codominant trees. Compare the same species at the same reference age; greater height generally indicates a higher site index.
Memory cue: Same species + same age + taller dominant trees = higher site index.
Look at what you actually have: a twig, a leaf, needles, a cone, or bark. Sort the specimen by foliage and leaf arrangement. Compare details such as margins, buds, undersides, veins, and fruit. Then name the tree and say two visible clues. For compound leaves, check where the whole leaf attaches to the twig: leaflets do not each have a bud at their base.
Memory cue: Your best answer sounds like: “It is ___ because I see ___ and ___. It is not ___ because ___.”
Search the full list. Identify from several clues, not a single leaf shape.
Fagus grandifolia
Smooth gray bark; simple alternate leaves with straight side veins and toothed edges.
Compare: Check the twig and bark together; smooth bark alone is not enough.
Ulmus americana
Simple alternate leaves; look for an uneven leaf base and double-toothed margin.
Compare: Compare the leaf base and teeth with other elms.
Ilex opaca
Evergreen, alternate leaves often have stiff spines; red berries may be present.
Compare: Berry color is seasonal; inspect the leaf and twig.
Taxodium distichum
A deciduous conifer with soft, feathery branchlets and small round cones.
Compare: Unlike pines, its short leaves are attached along feathery branchlets.
Prunus serotina
Alternate, finely toothed leaves; check the petiole glands and bark when available.
Compare: Use several features; a detached leaf may be confused with other toothed leaves.
Fraxinus caroliniana
Opposite, pinnately compound leaves; inspect the twig to confirm opposite attachment.
Compare: Opposite leaves are a strong clue; compare leaflet number and shape.
Diospyros virginiana
Simple alternate leaves with smooth edges; older bark often forms dark blocky plates.
Compare: Bark texture can help when leaves alone are uncertain.
Ostrya virginiana
Simple alternate leaves with doubly toothed margins; fruit clusters resemble small hops.
Compare: The hop-like fruit is especially helpful when present.
Carpinus caroliniana
Simple alternate, sharply toothed leaves; trunk can look smooth and muscle-like.
Compare: Check both the leaf teeth and the distinctive trunk when available.
Cercis canadensis
Alternate, heart-shaped leaves; pink-purple flowers often grow on branches before leaves.
Compare: The heart-shaped leaf and flower placement help separate it from maples.
Cornus florida
Opposite leaves with curved side veins; showy spring bracts surround small flowers.
Compare: Follow the veins toward the leaf tip and confirm opposite arrangement.
Quercus laurifolia
Alternate, narrow simple leaves; edges are often smooth or only lightly lobed.
Compare: Oak leaves vary; compare shape and acorn/cap if available.
Quercus virginiana
Evergreen oak with thick, oblong leaves and rounded tips; broad spreading limbs are common.
Compare: Look for leathery leaves and the specimen's growth form, not just its evergreen habit.
Gordonia lasianthus
Simple alternate leaves that are narrow and often paler underneath; white flowers may appear.
Compare: Check the whole leaf and underside; do not confuse it with a pine because of its name.
Pinus taeda
Needles are commonly in bundles of three; inspect needle length and cone features too.
Compare: Longleaf and some slash pines can also have three needles per bundle.
Pinus palustris
Very long needles, commonly three per bundle; large silvery-white terminal buds are a strong clue.
Compare: Three needles alone do not prove longleaf; check length, buds, and cones.
Carya tomentosa
Alternate pinnately compound leaves, usually with several large leaflets; nut and husk help.
Compare: Compare leaflet count, leaflet size, twig, and nut rather than one trait.
Carya glabra
Alternate compound leaves with fewer, narrower leaflets than some hickories; pear-shaped nut may help.
Compare: Hickories are easy to confuse; count leaflets and inspect twig and fruit.
Quercus stellata
Oak leaf often has a cross-like outline from its paired broad middle lobes.
Compare: Look for the blocky lobes and compare acorns when available.
Acer rubrum
Opposite, simple leaves, usually with three to five lobes and toothed edges.
Compare: Opposite arrangement separates it from alternate-leaved Sweetgum.
Morus rubra
Alternate leaves may be unlobed or lobed; surfaces often feel rough.
Compare: Leaf shape varies, even on one tree; verify arrangement and texture.
Pinus clausa
Needles are usually two per bundle; some cones remain closed until heated or dried.
Compare: Bundle count helps, but check cones and the full specimen.
Sassafras albidum
One tree can carry oval, mitten-shaped, and three-lobed leaves; crushed foliage is aromatic.
Compare: Do not reject sassafras because one leaf lacks a mitten shape.
Quercus shumardii
Alternate, deeply lobed oak leaves with bristle tips; acorns can support identification.
Compare: Compare the depth and shape of the lobes with other red oaks.
Pinus elliottii
Needles occur in bundles of two or three; woody cones often have noticeable prickles.
Compare: Bundle count overlaps with other pines; check needles and cones together.
Catalpa bignonioides
Very large simple leaves, often opposite or in whorls; long bean-like seed pods may remain.
Compare: The oversized leaves and long pods are strong clues.
Magnolia grandiflora
Large, thick, glossy evergreen leaves; the underside often has rusty-brown hairs.
Compare: Turn the leaf over; the underside helps distinguish it from Sweetbay.
Juniperus silicicola
Evergreen foliage is scale-like or needle-like; small blue berry-like cones may occur.
Compare: Check the foliage against cedar/juniper references and inspect the twig.
Celtis laevigata
Simple alternate leaves with a lopsided base and toothed upper edge; small berries may appear.
Compare: The base and upper-margin teeth help separate it from look-alikes.
Nyssa sylvatica var. biflora
Simple alternate leaves; wetland habitat and dark blue fruits can support identification.
Compare: Compare leaf shape and petiole; habitat is a clue, not proof.
Magnolia virginiana
Simple alternate leaves with smooth edges and a silvery-white underside.
Compare: Memory cue: Sweetbay wears silver; Southern Magnolia often wears brown underneath.
Liquidambar styraciflua
Alternate, star-shaped leaves with pointed lobes and toothed margins; spiny ball fruits may appear.
Compare: Red Maple can also be lobed, but its leaves are opposite.
Platanus occidentalis
Alternate, broad leaves with three to five lobes; mottled bark often peels in patches.
Compare: Use bark and the leaf base, not just the lobed outline.
Quercus laevis
Alternate oak leaves with narrow lobes; three prominent lobes often suggest a turkey-foot shape.
Compare: Lobes vary; compare the full leaf and acorn cap.
Carya aquatica
Alternate pinnately compound leaves, often with several narrow leaflets; associated with wet sites.
Compare: Compare leaflet shape, twig, and habitat with other hickories.
Quercus nigra
Alternate leaves are variable; many are narrow near the base and broader near the tip.
Compare: Some leaves are entire while others are shallowly lobed; shape varies.
Myrica cerifera
Aromatic evergreen shrub or small tree with narrow, leathery leaves and waxy blue-gray berries.
Compare: Crush a leaf gently to notice fragrance; never taste plant material.
Quercus alba
Alternate leaves have rounded lobes without bristle tips.
Compare: Rounded lobes distinguish the white-oak group from bristle-tipped red-oak leaves.
Ulmus alata
Simple alternate leaves with double-toothed edges; corky ridges may form on twigs.
Compare: Check the twig ridges along with the leaf base and teeth.
Liriodendron tulipifera
Simple alternate leaf with four broad lobes and a squared-off or notched tip.
Compare: It is a magnolia relative, despite the common name poplar.
Juglans nigra
Alternate pinnately compound leaves with many leaflets; crushed foliage and green husks are distinctive.
Compare: Check whether the terminal leaflet is present; it can be small or missing.
Prunus caroliniana
Evergreen, alternate simple leaves that are glossy and finely toothed.
Compare: Check leaf shape, sheen, and any cherry-like fruits when present.
Populus deltoides
Large triangular alternate leaves with a flattened petiole that lets leaves flutter.
Compare: The triangular blade and flat petiole are useful together.
Acer floridanum
Opposite, simple, lobed leaves; compare lobes and undersides with other maples.
Compare: Maples can be difficult to separate by leaf alone; check the twig and full key.
Bumelia lanuginosa
Alternate simple leaves; small dark fruits and short spur-like twigs may help.
Compare: Use a full twig specimen and an official photo/key; leaves can be variable.
Bursera simaruba
Peeling reddish-copper bark is a standout feature; leaves are alternate and compound.
Compare: Check bark and the arrangement of leaflets together.
Annona glabra
Simple alternate leaves with smooth edges; large green fruit may be present near wetlands.
Compare: Use the leaf and fruit together; habitat alone is not enough.
Persea borbonia
Evergreen, alternate simple leaves; gently crushed leaves have an aromatic scent.
Compare: Do not taste leaves; compare leaf shape and aroma with a field key.
Coccoloba uvifera
Large, nearly round leaves with prominent veins; grape-like fruit clusters may form.
Compare: The round leaf and strong veins are useful clues.
Pinus glabra
Pine with needles commonly in bundles of two; inspect cone, twig, and bark too.
Compare: Two-needle bundles occur in other pines, so bundle count is not enough.
Learn the name, recognize its shape, and connect it to its field job.
For each specimen, name the host, affected part, and visible pattern before choosing a disorder.
Inspect the host, affected part, pattern, and any visible sign. Compare it with the official event photo guide before naming it.
Inspect the host, affected part, pattern, and any visible sign. Compare it with the official event photo guide before naming it.
Inspect the host, affected part, pattern, and any visible sign. Compare it with the official event photo guide before naming it.
Inspect the host, affected part, pattern, and any visible sign. Compare it with the official event photo guide before naming it.
Inspect the host, affected part, pattern, and any visible sign. Compare it with the official event photo guide before naming it.
Large pitch tubes low on the trunk can be a clue; compare location and gallery pattern.
Brown spots and bands on pine needles can help identify this disease.
Inspect the host, affected part, pattern, and any visible sign. Compare it with the official event photo guide before naming it.
Inspect the host, affected part, pattern, and any visible sign. Compare it with the official event photo guide before naming it.
Inspect the host, affected part, pattern, and any visible sign. Compare it with the official event photo guide before naming it.
Inspect the host, affected part, pattern, and any visible sign. Compare it with the official event photo guide before naming it.
Inspect the host, affected part, pattern, and any visible sign. Compare it with the official event photo guide before naming it.
Look for rounded galls on pine twigs or branches; compare the host and gall with the official photo key.
A silken tent is commonly built where several branches meet; caterpillars travel to feed.
The web encloses leaves near the ends of hardwood branches.
Inspect the host, affected part, pattern, and any visible sign. Compare it with the official event photo guide before naming it.
Pines may develop elongated, spindle-shaped galls on stems or branches; orange spores can appear.
Inspect the host, affected part, pattern, and any visible sign. Compare it with the official event photo guide before naming it.
Inspect the host, affected part, pattern, and any visible sign. Compare it with the official event photo guide before naming it.
Inspect the host, affected part, pattern, and any visible sign. Compare it with the official event photo guide before naming it.
Inspect the host, affected part, pattern, and any visible sign. Compare it with the official event photo guide before naming it.
Inspect the host and gallery pattern; Ips galleries often have a central chamber with branching galleries.
Inspect the host, affected part, pattern, and any visible sign. Compare it with the official event photo guide before naming it.
Inspect the host, affected part, pattern, and any visible sign. Compare it with the official event photo guide before naming it.
Inspect the host, affected part, pattern, and any visible sign. Compare it with the official event photo guide before naming it.
Inspect the host, affected part, pattern, and any visible sign. Compare it with the official event photo guide before naming it.
Inspect the host, affected part, pattern, and any visible sign. Compare it with the official event photo guide before naming it.
Inspect the host, affected part, pattern, and any visible sign. Compare it with the official event photo guide before naming it.
Inspect the host, affected part, pattern, and any visible sign. Compare it with the official event photo guide before naming it.
Raised, blister-like areas appear on oak leaves.
Inspect the host, affected part, pattern, and any visible sign. Compare it with the official event photo guide before naming it.
Inspect the host, affected part, pattern, and any visible sign. Compare it with the official event photo guide before naming it.
Inspect the host, affected part, pattern, and any visible sign. Compare it with the official event photo guide before naming it.
Inspect the host, affected part, pattern, and any visible sign. Compare it with the official event photo guide before naming it.
Inspect the host, affected part, pattern, and any visible sign. Compare it with the official event photo guide before naming it.
Inspect the host, affected part, pattern, and any visible sign. Compare it with the official event photo guide before naming it.
Look for resin flow, branch dieback, and cankers; compare the host and full symptom pattern.
Inspect the host, affected part, pattern, and any visible sign. Compare it with the official event photo guide before naming it.
Inspect the host, affected part, pattern, and any visible sign. Compare it with the official event photo guide before naming it.
Inspect the host, affected part, pattern, and any visible sign. Compare it with the official event photo guide before naming it.
A wet, often sour-smelling ooze may run from a wound on the trunk.
Small pitch tubes and winding S-shaped galleries beneath bark are classic identification clues.
Inspect the host, affected part, pattern, and any visible sign. Compare it with the official event photo guide before naming it.
Inspect the host, affected part, pattern, and any visible sign. Compare it with the official event photo guide before naming it.
Inspect the host, affected part, pattern, and any visible sign. Compare it with the official event photo guide before naming it.
Connect what you see on the leaf, fruit, or tree to a clear explanation.
Learn the graft, compare fruit and foliage, and study the field signs that appear in Florida citrus competitions.
The Florida FFA event page lists citrus disease and disorder identification, pests and beneficial organisms, common weeds, and citrus rootstocks, leaves, and fruit. Practice by describing what you can observe, then using the current event resources to name it.
Try this: A useful field note records the plant part, pattern, location, and one comparison clue.
A commercial citrus tree often joins two genetically distinct parts. The scion is the above-ground part that produces the chosen branches, leaves, and fruit. The rootstock is the lower trunk and root system. Rootstock choice can affect stress tolerance, tree size, fruit quality, and yield.
Try this: Find the graft union: the chosen fruit variety grows above it; the rootstock is below.
Huanglongbing, or HLB, is commonly called citrus greening. It is a serious bacterial disease spread by the Asian citrus psyllid. A common leaf clue is blotchy mottle that is not symmetrical across the midrib, but no single picture should replace the official identification guide.
Try this: Remember the chain: HLB → bacterial disease → Asian citrus psyllid → blotchy mottling and tree decline.
An insect or mite is a pest organism; a bacterium or fungus can be a pathogen; environmental or nutrient stress can cause a disorder. Similar-looking symptoms can have different causes. Record which plant part is affected, how the pattern spreads, and whether insects or signs are visible. Use contest reference images or ask an advisor before choosing a diagnosis.
Try this: Say what is visible first: “I see ___ on the ___.” Then explain the clue that supports your diagnosis.
When comparing a citrus sample, inspect the whole fruit, peel texture, shape, size, seed clues if visible, leaf shape, petiole, and any stem or branch features provided. Color by itself can mislead. Use the names and sample set supplied by your advisor; cultivar traits can overlap.
Try this: Look at fruit + leaf + plant tag together. Do not name a variety from one color clue.
Take a test, get your score, see which topics need another round, then retake it.
Leilani is sharing the tools that help teammates study together: ask why, prove an answer, and celebrate the next step.
Try “Tree Court”: name the specimen, prove it with two clues, then explain the look-alike you ruled out.
Open the Tree ID cards →
This site is a study helper. Your advisor’s current contest materials are the final word on what is tested this year.
Check Florida FFA event resources →Use these references to check a clue or read beyond the quick lesson.
Practice questions on this site were written for study and are not official FFA test questions. The 2016 forestry guide is a published reference; use the advisor’s current event directions for this season.