Simpleton’s Key

IDENTIFICATION KEYS:

Simpleton’s Key:

Most common symptoms with their most common causes:

No Seedlings—old seeds, cold soil, damping off fungi, eaten by pests

Wilting—too little or too much H2O, leaf-sucking insects, root insects, wilt fungi, nematodes

Mold on Buds or Leaves—grey mold, brown blight, downy mildew, pink rot, powdery mildew (do not confuse mold with webbing)

Webbing—spider mites, budworms, hemp borers, leaf-eating caterpillars

Spots on Leaves—leaf-sucking insects, leaf fungi, leafminers, too much fertilizer

Brown and Curling Leaf Margins—too much fertilizer, dry air, too little potassium, brown blight

Holes in Leaves—caterpillars, beetles, grasshoppers, bacteria

Pale Green or Yellow Leaves—not enough nitrogen, poor pH, nematodes, soil fungi, leaf-sucking insects

Lumpy Stems—European corn borers, hemp borers, beetle grubs, canker fungi, stem nematodes

Spindly Stems—not enough light, too much yellow light, temperature too hot, soil too wet, not enough nitrogen or potassium or calcium

Disfigured Roots—soil fungi, nematodes, broomrape, grubs, maggots, rodents

Tips of Limbs or Tops Missing—rodents, rabbits, deer, cattle or HUMANS

Resource

Hemp Diseases and Pests  Management and Biological Control,  J. M. McPartland, R. C. Clarke, and D. P. Watson.  2000 copyright

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