Lettuce Fungicide use in the United States

1 lettuce

1.1 bottom rot
1.2 downy mildew
1.3 lettuce drop
1.4 powdery mildew

lettuce
bottom rot

bottom rot symptoms consist largely of deep reddish-colored lesions on leaves spread leaf leaf until entire head rotted. trials vinclozolin have demonstrated effectiveness in controlling bottom rot. research indicated when treated, crop yields rise 36%.

downy mildew

downy mildew extremely common disease of lettuce plant. largely due disease s quick germination period—three hours—and lettuce plant being susceptible @ growth stages. 1 study estimated in untreated florida fields 75% of lettuce infected downy mildew , considered unsalable. research maneb has shown ability reduce number of lesions per 10 plants 187 one. ebdc , fosetyl-al have been shown effective in florida trials reduced unmarketable heads 2%.

lettuce drop

lettuce drop resilient disease of lettuce plant. can found in lettuce-growing regions of u.s. , able survive in soil decade after infecting field. fungus appears on plant white mass on leaf turns hard black growth. these growths release spores infect lettuce plant pathogens move stalk, killing tissue travel. use of dcna, iprodione, , vinclozolin month before harvest has been shown reduce lettuce drop in treated fields. in treated california fields fungicides able reduce yield losses low 5%.

powdery mildew

powdery mildew attacks lettuce plants robbing them of nutrients within leaf. fungus appears white growth on upper surface of leaf uses small tubes pull nutrients out of plant. causes severe discoloration , eventual defoliation of plant. applications of sulfur recommended primary way control powdery mildew on lettuce.