HELICOVERPA SOJA PDF

Natural enemies[ edit ] More than insect species prey on H. When the females find their prey, they use their antennae to position themselves and deposit eggs into the host. Long-range dispersal involves adults flying up to 10 meters above the ground and moving downwind from crop to crop. Drought -responsive diapause has also been observed in the summer.

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Mounted, dorsal view Mounted, ventral view The female cotton bollworm can lay several hundred eggs, distributed on various parts of the plant. Under favourable conditions, the eggs can hatch into larvae within three days and the whole lifecycle can be completed in just over a month. They are white, later becoming greenish. Their colouring is variable, but mostly greenish and yellow to red-brown. The head is yellow with several spots. Three dark stripes extend along the dorsal side and one yellow light stripe is situated under the spiracles on the lateral side.

The ventral parts of the larvae are pale. If disturbed, they fall from the plant and curl up on the ground. The pupae develop inside a silken cocoon [5] over 10 to 15 days in soil at a depth of 4—10 centimetres 1. Other hosts include groundnut, okra, peas, field beans, soybeans, lucerne, Phaseolus spp. The economic threshold of harmfulness in central Asia is three to five larvae per hundred plants of long-staple cotton and eight to 12 larvae per hundred plants on medium-staple cotton.

When the bolls are damaged, some will fall off and others will fail to produce lint or produce lint of an inferior quality. Secondary infections by fungi and bacteria are common and may lead to rotting of fruits. Injury to the growing tips of plants may disturb their development, maturity may be delayed, and the fruits may be dropped. Monitoring is possible by the use of sex pheromone traps.

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HELICOVERPA SOJA PDF

Yokree If an incursion happened as a result of an isolated, low frequency human-mediated dispersal event, then an eradication could feasibly be contemplated. Larvae develop through 5—7 instars and their physiological thermal requirements have been estimated e. Helicoverpa armigera is found in areas that under natural rainfall conditions extended periods with soil moisture below permanent wilting point, and which appear too arid to support sufficient crop growth and hence population growth for H. Australian Journal of Zoology.

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Helicoverpa

Mounted, dorsal view Mounted, ventral view The female cotton bollworm can lay several hundred eggs, distributed on various parts of the plant. Under favourable conditions, the eggs can hatch into larvae within three days and the whole lifecycle can be completed in just over a month. They are white, later becoming greenish. Their colouring is variable, but mostly greenish and yellow to red-brown. The head is yellow with several spots. Three dark stripes extend along the dorsal side and one yellow light stripe is situated under the spiracles on the lateral side.

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