Why is Helicoverpa armigera important?
Since its introduction and establishment in Brazil in 2013 and subsequent spread through most of Latin America, the Old World bollworm, Helicoverpa armigera (Hübner), has become an economically important pest of soybean, cotton, and other crops.
What is the damaging stage in gram pod borer?
The pest is active through out the year but damage to gram is cause from November to March. The damage is caused by the larvae which feed on the leaves and destroy the seedlings in the early stages.
How do you control Helicoverpa armigera?
Although the cotton bollworm Helicoverpa armigera has traditionally been controlled by application of chemical pesticides, chemical control selects for resistance, pollutes the environment, and endangers human health.
Which of the following can be used against Helicoverpa armigera?
The results suggested that HaNPV can be used in combination with spinetoram and emamectin benzoate for the management of resistant population of H. armigera.
Why is Helicoverpa a major pest?
It is a multivoltine with diapause, highly fecund and capable of moving long distances as adults (Fitt, 1989). Thus, they can rapidly exploit host crops, particularly monocultures. Another important factor contributing to its pest status is the relatively large size and quick development.
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.
Which stage of gram crop is damaged by Helicoverpa armigera?
The correct answer is Early stage.
How do you control borer pods?
Apply biopesticides such as Bt or neem products. They usually give good control of pod borers, provided they are applied to pods before the young caterpillars enter into the pods. Once the caterpillars have entered the pods they are difficult to control and by then they have caused damage.
How do you control fruit borer in tomatoes?
Spraying of Endosulfan 35EC @ 2.0l/ha or Cypermethrin 10EC @ 500 ml/ha in 250 liters of water /ha the first spray should be at the flowering stage and followed by sprays at either 10 or 15 days interval gives effective control of fruit borer.
Which of the following insect is a serious pest of cotton and okra?
Spotted Bollworms. These two species of bollworms cause heavy damage to American cotton and are also found on okra and some other malvaceous plants.
Which of the following pest causes damage to the grain at milky stage?
Symptom of Damage : Sucking the sap from individual grains, which are in milky stage. Due to de-sapping, grains show brownish discoloured patches on the husk.
What is the common name of Helicoverpa armigera?
cotton bollworm
Helicoverpa armigera 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.
Which is the damaging stage of gram cutworm?
larva
The larva of Gram cutworm causes great damage to the crop. Its larvae disappear during the day and come out in the evening to damage the crop.
How can you tell if a bean pod is a borer?
They are pale cream, with two rows of dark dots on their backs (Photos 1&2). They grow to 18 mm before they exit the pods and pupate in the soil. The moths (Photos 3&4) have brown front wings, with white patches. The hind wings are mostly white with a brown border.
Which is a natural enemy of tomato fruit borer?
Predatory ants, spiders, damselflies, robber flies, parasitic wasps and parasitic flies are all natural enemies of the fruit borer.
Which is major pest of okra?
The main insect pests of okra observed were flea beetles (Podagrica decolorata), white flies (Bemisia tabaci), jassids (Jacobiasca sp), aphids (Aphis gossypii) and caterpillars of Lepidoptera (Syllepte derogata).
Which of the following paste damage the paddy fields?
PESTS OF IMPORTANT CROPS
| S N. | Name of the pest |
|---|---|
| 1. | Tissue-borers, Tryporyza incertulas |
| 2. | Gundhi bugs: Leptocorisa varicornis |
| 3. | Paddy gall fly, Pachydiplosis oryzae |
| 4. | Rice hispa; Dicladispa armigera |
Which insects do not damage horticulture crops?
Caddisflies insects do NOT damage horticultural crops (as immatures).
What damage do cutworms?
Identifying Cutworm Damage They primarily feed on roots and foliage of young plants, and will even cut off the plant from underneath the soil. In most cases, entire plants will be destroyed; they do a lot of damage in no time at all. Even if only the bottom of the plant is destroyed, the top will often shrivel and die.
What is Helicoverpa armigera and is it dangerous?
Helicoverpa armigera is a polyphagous pest of agricultural crops. We are aware of two pest risk assessments for H. armigera; for the USA [10] and for Europe [11]. The risk assessment for the USA focused attention on the H. armigera incursion risks posed by the movement of passengers and goods.
How do you get rid of Helicoverpa armigera?
Helicoverpa armigera, a dreaded pest of sunflower is parasitized by two species of tachinid, namely, Carcelia illata and Exorista xanthaspis by up to 24.54% in Gujrat (Patel and Talati, 1987). Timely spray of HaNPV at 450 LE ha −1 twice can protect sunflower crops from head borer.
Does Helicoverpa armigera (Hübner) cause damage to tomato plants?
Damages caused by Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) in two varieties of tomato (Solanum lycopersicum L.) in Namibe province, Angola. (Daños producidos por Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) en dos variedades de tomate (Solanum lycopersicum L.) en la provincia Namibe, Angola.).