Joanne Whalen, Extension IPM Specialist; jwhalen@udel.edu
Cabbage
Continue scouting fields for imported cabbage worm and diamondback larvae as soon as plants are placed in the field. With the recent warm temperatures, we are starting to see an increase in moth egg laying activity. As a general guideline, a treatment is recommended if you find 5% of the plants infested with larvae.
Peas
Be sure to sample peas for pea aphids as soon as small seedlings emerge. On small plants, you should sample for aphids by counting the number of aphids on 10 plants in 10 locations throughout a field. On larger plants, take 10 sweeps in 10 locations. As a general guideline, a treatment is recommended if you find 5-10 aphids per plant or 50 or more aphids per sweep.