wood volume loss in aspen than any other disease. Advanced decay and discoloration greatly reduce the

they serve as entrance points for stain and decay fungi that further reduce tree quality and

separating these symptoms from Dutch elm disease. This disease is identified by the butterscotch discoloration of the

petioles on affected branches remain yellow, and there is often a brown discoloration in the

on a tree, particularly on new growth. Heavy infestations distort foliage, cause terminal dieback, reduce tree vitality, weaken the

Type A of P. gregata causes severe foliar symptoms and internal stem discoloration; hence it is usually

initial means of entry into the plant. Symptoms include stunting, wilting, vascular discoloration, cankers on stems, and

wood volume loss in aspen than any other disease. Advanced decay and discoloration greatly reduce the

rusting, mottling, discoloration, distortion, or stunting of leaves; and spotting, blighting, stunting, discoloration, distortion, or mottling of

they serve as entrance points for stain and decay fungi that further reduce tree quality and

may also turn reddish brown. Due to similar symptom of pith tissue discoloration, charcoal rot may be

buried seeds remain germinable for more than two years (Van, unpub. data). Forest fires reduce competition, prepare ash-enriched

lesions on the roots followed by root rot. A characteristic chocolate brown discoloration on the stem

separating these symptoms from Dutch elm disease. This disease is identified by the butterscotch discoloration of the

petioles on affected branches remain yellow, and there is often a brown discoloration in the

Type A of P. gregata causes severe foliar symptoms and internal stem discoloration; hence it is usually

or under the coat tissue (4). Symptomatic seedlings show brownish to black discoloration at the soil

Phytophthora infection may cause pre- or post-emergence damping-off. Infected seedlings may show tan brown discoloration with soft and

on a tree, particularly on new growth. Heavy infestations distort foliage, cause terminal dieback, reduce tree vitality, weaken the

Subsequent reports have indicated it causes leaf spots and brown to black discoloration of radish

petiole and rachis. Cross sections of the petiole or rachis reveal discoloration of the

Seeds in close contact with pod lesions can be infected, developing gray or brown discoloration. Symptomatic area on seed

the phloem. High populations of corn leaf aphids causes leaf mottling and discoloration; reddening of corn

initial means of entry into the plant. Symptoms include stunting, wilting, vascular discoloration, cankers on stems, and

rusting, mottling, discoloration, distortion, or stunting of leaves; and spotting, blighting, stunting, discoloration, distortion, or mottling of

new leaves, and limit canopy expansion. Intense mite injury occurring through reproductive stages will reduce pod number, seeds per

buried seeds remain germinable for more than two years (Van, unpub. data). Forest fires reduce competition, prepare ash-enriched