Acephate and Spinosad Impact on Parasitoids of Heliothis virescens (F.) (Lepidoptera: Noctuidae) on Tobacco in South Carolina

Manley, Donald G.; Markwell, Poppy

doi:10.18474/0749-8004-41.4.399

Cited by 1 publication

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The complex of emitted volatiles can be modified or induced by herbivorous insect feeding, in this case stink bug feeding, and can alter the attractiveness of the host for lepidopteran pests (von Mérey et al 2013, Zeilinger et al 2015a, have a negative impact on the development of larvae (von Mérey et al 2013), or attract natural biological control agents (Turlings et al 2008). The kernels of stink bug-injured ears are also often exposed from the husk, which normally protects developing H. zea larvae from predators and parasitoids (Manley et al 1991). The combination of increased exposure to stink bug-injured ears and plant volatile attraction of natural enemies may limit H. zea infestations in these areas of the field.…”

Section: Growth Stagementioning

confidence: 99%

Within-field spatial patterns of Helicoverpa zea (Lepidoptera: Noctuidae) and spatial associations with stink bugs and their injury in field corn

Bryant,

Greene,

Reay-Jones

2023

Journal of Economic Entomology

View full text Add to dashboard Cite

The corn earworm, Helicoverpa zea (Boddie) (Lepidoptera: Noctuidae), is a cosmopolitan pest in the field crop landscape in the southeastern United States. Field corn (Zea mays L.) is the most important midseason host for H. zea where intensive selection pressure occurs for resistance to insecticidal toxins from Bacillus thuringiensis (Bt). Because spatial patterns of H. zea in field corn have not been extensively studied, field corn was sampled for H. zea larvae and injury in 2021 and 2022. Patterns of spatial aggregation were identified in a number of fields in both larval populations and injury. Aggregation of H. zea larvae was less common at R5 than at R2. Associations between the spatial patterns of H. zea and the variability in crop phenology were identified in some fields, with positive associations between plant height and H. zea larvae, indicating that ovipositing H. zea moths avoid areas with reduced plant height and delayed reproductive maturity. Additionally, negative spatial associations between stink bug ear injury and H. zea larvae and their injury were found in a small number of cases, indicating some spatial interactions between the two pest complexes and their injury. Results from these studies provide valuable insight into the spatial patterns of H. zea in field corn. An understanding of the local dispersal and population dynamics of H. zea can be used to help further improve integrated pest management and insect resistance management programs for this major polyphagous pest.

show abstract