Why is Helicoverpa armigera important?
The Old World cotton bollworm Helicoverpa armigera (Lepidoptera: Noctuidae) is the most significant and impactful pest of agriculture in Asia, Europe, Africa and Australasia, causing damage to crops estimated at greater than US$2 billion annually, excluding socio-economic and environmental costs associated with its …
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How do you control Helicoverpa armigera?
Control of H. armigera has mostly depended on chemical insecticides and BT cotton (Guo, 1997; Ahmad et al., 1999; Wu and Guo, 2005). As a result of the continuous and widespread use of Bt cotton and long-term, large-scale, and indiscriminate chemical pesticide use, H.
Which stage of Helicoverpa armigera used to cause damage to the crops?
armigera can cause significant reductions for soybean in Brazil, and it is necessary to intensify monitoring and use of efficient and alternative control methods for the use of insecticide. In conclusion, our study shows that growth stage R5. 1 is more sensitive to damage by H. armigera than the R2 stage.
Which of the following can be used against Helicoverpa armigera?
Synthetic pyrethroids (deltamethrin, lambda-cyhalothrin and cypermethrin) were identified as the main insecticides (60%) used against H. armigera.
Why is Helicoverpa a major pest?
Helicoverpa armigera is a key pest of agriculture and horticulture in Pakistan. Costs of management and damage are gigantic in a wide range of food and fiber crops. It has been recorded on more than 100 cultivated and wild host plants. Key factors contributing to the pest status of H.
What is the common name of Helicoverpa armigera?
cotton bollworm
Helicoverpa armigeraHelicoverpa armigeraBollworm is the common term for a moth larva that attacks the fruiting bodies of certain crops, especially cotton. The most common moths known as bollworms are: Red or Sudan bollworm, Diparopsis castanea. Rough bollworm, Earias perhuegeli. Spotted bollworm, Earias fabia.https://en.wikipedia.org › wiki › BollwormBollworm – Wikipedia is a species of Lepidoptera in the family Noctuidae. It is known as the cotton bollworm, corn earworm, Old World (African) bollworm, or scarce bordered straw (the lattermost in the UK, where it is a migrant). The larvae feed on a wide range of plants, including many important cultivated crops.
How do you control cotton bollworms?
Cultural Control
Cotton bollwormsCotton bollwormsBollworm is the common term for a moth larva that attacks the fruiting bodies of certain crops, especially cotton. The most common moths known as bollworms are: Red or Sudan bollworm, Diparopsis castanea. Rough bollworm, Earias perhuegeli. Spotted bollworm, Earias fabia.https://en.wikipedia.org › wiki › BollwormBollworm – Wikipedia are attracted to succulent, rank-growing cotton plants; keep water, fertilizer, and plant density at recommended levels to avoid rank growth. Because populations seldom reach damaging levels before late summer, manage the crop for early maturing and plan to defoliate by late September.
Which insecticide is best for cotton?
Chemical Control:
Avoid use of conventional sprays repeatedly. Use Neem based insecticides like 5% Neem seed kernel extract (NSKE) and commercial Neem based formulations @ 500-600 ml/ha, starting from 45 days age of the crop or when ETL is reached.
Which biocontrol agent controls bollworm in cotton?
Trichogramma chilonis
Trichogramma chilonis is an egg parasitoid and agent under biological control of lepidopteran insect pests. It is effective against bollwormsbollwormsBollworm is the common term for a moth larva that attacks the fruiting bodies of certain crops, especially cotton. The most common moths known as bollworms are: Red or Sudan bollworm, Diparopsis castanea. Rough bollworm, Earias perhuegeli. Spotted bollworm, Earias fabia.https://en.wikipedia.org › wiki › BollwormBollworm – Wikipedia of cotton.
What is the scientific name of cotton bollworm?
Helicoverpa armigeraCotton bollworm / Scientific name
How does bollworm affect cotton?
Cotton bollwormCotton bollwormBollworm is the common term for a moth larva that attacks the fruiting bodies of certain crops, especially cotton. The most common moths known as bollworms are: Red or Sudan bollworm, Diparopsis castanea. Rough bollworm, Earias perhuegeli. Spotted bollworm, Earias fabia.https://en.wikipedia.org › wiki › BollwormBollworm – Wikipedia larvae damage bolls and squares. Larvae chew holes into the base of bolls and may hollow out locks. Moist frass usually accumulates around the base of the boll. Larvae may also chew shallow gouges in the boll surface, which can become infected with rot organisms.
What does Helicoverpa do to cotton?
Cotton bollworm (Helicoverpa armigera) larvae damage crops by feeding on developing seed; reducing yield and grain quality. This pest also has a track record for developing resistance in response to insecticide selection pressure, which makes it a challenge to control.
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 bollworm disease?