• UD Search
Agriculture & Natural Resources

IPM- Watermelon Pest Management

University of Delaware IPM Program

Joanne Whalen, Extension IPM Specialist and Bill Cissel, Extension IPM Agent

 

Pest Scouting Guidelines Treatment Thresholds General Comments
Cucumber Beetles Examine 5 plants in 5-10 locations for the number of beetles per plant and % plants showing injury (light, moderate, heavy) 2 per plant – Most important on young seedlings-Carefully check field margins, under plastic, cracks in ground around base of plants
Thrips Examine 5 crown leaves in 5-10 locations for the presence of thrips and feeding injury(silver flecks esp near large leaf veins) Leaf injury is heavy and plants are not actively growing Generally a problem early, when plants are drought stressed
Melon Aphid Examine 5 runners in 5-10 locations and record the % of the runners infested with 5 or more aphids per leaf 20% or more of the runners infested with 5 or more aphids per leaf – Generally occurs in spots- Be sure to note presence of beneficials
Spider Mites Examine 5 crown leaves in 5-10 locations for the presence of mites and mite injury 20-30% of the crowns infested with 1-2 mites per leaf – Be sure to sample carefully near rye strips and in the sandiest areas of the field
Leafhoppers

Examine 5 runners in 5-10 locations for the presence of leafhopper nymphs. A sweep net can also be used to check for adults.

Detection of “hopper burn” on leaf edges – Begin to watch for migrant adults after bloom 

 

 

Print This Post Print This Post