Update on the Area-Wide Budworm/Bollworm Management Program with Virus in the United States
Mar 8, 2019
An area-wide management program with Helicoverpa zea nucleopolyhedrovirus (HzSNPV) has been conducted in the Mississippi Delta to control the first generation of cotton bollworm and tobacco budworm in wild geranium. Results are reported for the 1997 area-wide management program using a lower HzSNPV application rate. The HzSNPV formulation used in this study consisted of GemstarTM LC (Thermo Trilogy, Inc.) diluted in water with an equal volume of cotton seed oil with an emulsifier. Aerial applications of the HzSNPV formulation were applied at a volume of 2.33 liters per ha and with an application rate of 2.5 X 1011 occlusion bodies (OB’s) per ha. Adult emergence, moth numbers and virus stability and activity were monitored to assess the effectiveness of the program. Adult emergence was reduced significantly (82.7%) in naturally-infested enclosure cages treated with the virus. Pheromone trap data suggested that total moth emergence was reduced 47% compared with moth emergence in untreated areas. Wild geranium treated with the virus retained >50% of the original activity 3 days after virus application. Virus mortality was >80% from samples collected randomly immediately after application. A grower-funded program for managing Heliothis/Helicoverpa has been proposed for the Mississippi Delta that would encompass approximately 324,000 ha at an estimated total cost of US$ 1,905,120.