What is the economic importance of Helicoverpa armigera?
What is the economic importance of Helicoverpa armigera?
Economic importance: The damage caused by H. armigera is annually estimated, world-wide, to exceed US$2 billion, and the bollworm is listed as an A2 quarantine pest by EPPO. In the Middle East it is a major pest of cotton, tomatoes and other solanaceous crops, legumes like peas and beans, and maize (corn).
How do I identify my Helicoverpa armigera?
They are white, later becoming greenish. The larvae take 13 to 22 days to develop, reaching up to 40 millimetres (1+1⁄2 in) long in the sixth instar. Their colouring is variable, but mostly greenish and yellow to red-brown. The head is yellow with several spots.
What is the damaging stage of Helicoverpa armigera?
Damage after full-pod stage leads to reduced potential to compensate for the damage. H. armigera feeds mostly in the middle third of soybean plants. The rate of seed-yield loss at R2 growth stage was 7.7 g per larva and 10.6 g per larva at R5.
What family is Helicoverpa armigera?
Owlet mothsCotton bollworm / FamilyThe Noctuidae, commonly known as owlet moths, cutworms or armyworms, are a family of moths. They are considered the most controversial family in the superfamily Noctuoidea because many of the clades are constantly changing, along with the other families of the Noctuoidea. Wikipedia
What is the common name of Helicoverpa armigera?
cotton bollworm
Pictures
| Title | Caption |
|---|---|
| Adult | Helicoverpa armigera (cotton bollworm); adult. wingspan 3.5-4 cm, 14-18 mm long; forewings with 7-8 blackish spots on the margin and a broad, irregular, transverse brown band. Hindwings pale-straw colour with a broad dark-brown border containing a paler patch, with yellowish margins. |
How do you control Helicoverpa armigera?
Control without insecticides Other management tools include: Insect-resistant genetically modified (GM) cotton has been developed to produce a highly specific toxin from a naturally occurring bacterium called Bacillus thuringiensis (or Bt) that kills helicoverpa larvae when ingested.
How do you control helicoverpa?
Removing alternate hosts in and around crops can prevent the build-up of Helicoverpa and other insect pests. Spring trap crops have been successfully used as an area-wide management tool for reducing the size of the overall helicoverpa population as it emerges from diapause in spring.
What season is the helicoverpa eggs are active?
armigera and H. punctigera take 4-6 weeks from egg to adult in summer, and 8-12 weeks in spring or autumn. The helicoverpa lifecycle stages are egg, larva, pupa and adult (moth) (Figure 6). Fertile eggs hatch in about three days during warm weather (250C average) and 6–10 days in cooler conditions.
Which insect order does Helicoverpa armigera belong?
LepidopteraCotton bollworm / Order
What season is the Helicoverpa eggs are active?
What is BPH in agriculture?
Both brown planthopper(BPH) and white backed planthopper(WBPH) are known for their resistance to commonly used insecticides including the neonicotinoids. Hence crop failures due to severe pest outbreaks are very common in many rice-growing tracts of India.
How do you control Helicoverpa?
