IL Pesticide Applicator; Seed
Treatment Q’s and A’s
Pythium & phytophthora - <correct answer >>seedling root disease
Fungal-like organisms, considered water molds (spores swim in water)
Can infect & kill all season long as soil wet
Cause soft rot of seed
Tolerant & resistant varieties available
Fusarium seedling blight & root rot - <correct answer >>seedling root disease
Can infect/damage early or late
Non-descript symptoms (generally off color-dark black to completely rotted, sometimes
pinkish)
Infected seeds can result in seedling blight
Rhizoctonia - <correct answer >>seedling root disease
Usually a problem when crop is stressed (soil compaction, dry emergence conditions, herbicide
injury)
, Likes cool, then hot & dry weather
Stewart's bacterial wilt - <correct answer >>foliar disease
Carried by flea beetles (more common after mild winters
Field corn generally has good resistance
Stewart's bacterial wilt - <correct answer >>foliar disease
Long yellowish streaks, parallel to the veins
Wilting, may resemble nutritional problems or drought stress
Seedling crown may have chocolate-brown soft rotted cavity at base of the plant
Barley yellow dwarf virus - <correct answer >>viral disease
Obligate parasite vectored by aphids found along field border or in patches
Barley yellow dwarf virus - <correct answer >>viral disease
Seedling infection: winter kill, stunted growth, reduced tillers, & yellow leaves
Fall infection is more important than spring infection
Systemic seed treatment insecticides may help reduce
Treatment Q’s and A’s
Pythium & phytophthora - <correct answer >>seedling root disease
Fungal-like organisms, considered water molds (spores swim in water)
Can infect & kill all season long as soil wet
Cause soft rot of seed
Tolerant & resistant varieties available
Fusarium seedling blight & root rot - <correct answer >>seedling root disease
Can infect/damage early or late
Non-descript symptoms (generally off color-dark black to completely rotted, sometimes
pinkish)
Infected seeds can result in seedling blight
Rhizoctonia - <correct answer >>seedling root disease
Usually a problem when crop is stressed (soil compaction, dry emergence conditions, herbicide
injury)
, Likes cool, then hot & dry weather
Stewart's bacterial wilt - <correct answer >>foliar disease
Carried by flea beetles (more common after mild winters
Field corn generally has good resistance
Stewart's bacterial wilt - <correct answer >>foliar disease
Long yellowish streaks, parallel to the veins
Wilting, may resemble nutritional problems or drought stress
Seedling crown may have chocolate-brown soft rotted cavity at base of the plant
Barley yellow dwarf virus - <correct answer >>viral disease
Obligate parasite vectored by aphids found along field border or in patches
Barley yellow dwarf virus - <correct answer >>viral disease
Seedling infection: winter kill, stunted growth, reduced tillers, & yellow leaves
Fall infection is more important than spring infection
Systemic seed treatment insecticides may help reduce
