Difference between revisions of "Anthonomus grandis"
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[[File:Anthonomus_grandis_IPM1949054.jpg|250px|thumb|''Anthonomus grandis'' on a cotton boll (click on image to enlarge it)<br/>Author(s): F. Benci, Boll Weevil Research Laboratory<br/>Source: [http://www.ipmimages.org/browse/detail.cfm?imgnum=1949054 IPM Images]]] | [[File:Anthonomus_grandis_IPM1949054.jpg|250px|thumb|''Anthonomus grandis'' on a cotton boll (click on image to enlarge it)<br/>Author(s): F. Benci, Boll Weevil Research Laboratory<br/>Source: [http://www.ipmimages.org/browse/detail.cfm?imgnum=1949054 IPM Images]]] | ||
<font color="#800000">'''''Anthonomus grandis'''''</font> Boheman, 1843 - (boll weevil)<br/> | <font color="#800000">'''''Anthonomus grandis'''''</font> Boheman, 1843 - (boll weevil)<br/> | ||
is an important pest of cotton in Central and South America. It is suspected to be native to southern Mexico and Guatemala. It is found now in most areas of this continent where cotton is grown and was first recorded from the U.S.A. in 1892 and from Brazil in 1983. The weevil breeds in developing cotton bolls, effectively destroying the cotton. The spread of the weevil to the U.S.A. caused large-scale destruction of cotton crops in the beginning of the 20th century and the industry only slowly recovered through the development of pesticides like DTT. Even in the 1970s annual losses were still estimated at around US$ 200 million, with another US$ 75 million being spent on control effort. At that time about one third of all pesticides used in the U.S.A. where applied to cotton. | is an important pest of cotton in Central and South America. It is suspected to be native to southern Mexico and Guatemala. It is found now in most areas of this continent where cotton is grown and was first recorded from the U.S.A. in 1892 and from Brazil in 1983. The weevil breeds in developing cotton bolls, effectively destroying the cotton. The spread of the weevil to the U.S.A. caused large-scale destruction of cotton crops in the beginning of the 20th century and the industry only slowly recovered through the development of pesticides like DTT. Even in the 1970s annual losses were still estimated at around US$ 200 million, with another US$ 75 million being spent on control effort. At that time about one third of all pesticides used in the U.S.A. where applied to cotton. | ||
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| + | Since 1978, the USDA [http://en.wikipedia.org/wiki/Boll_Weevil_Eradication_Program Boll Weevil Eradication Program] has succeeded in gradually eliminating the weevil from the cotton growing areas of the U.S.A., using pheromone traps, cultural methods (adjusting planting time and removing plant residues) and insecticide (mainly malathion) applications. By 2012/13, the weevil survived in only a small area of Texas and operations mainly focused on monitoring efforts to confirm eradication. Also efforts are shifting to the northern parts of Mexico to prevent re-infestation. | ||
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The overwintering weevils emerge in spring, feed on young cotton foliage and lay their eggs on flower buds or cotton squares, one per bud/square. The larvae feed on the flower buds or developing bolls and new adults emerge after about 3 weeks under favorable conditions. There may be up to 10 generations in one season. Infested squares/bolls drop to the ground. The adults overwinter in leaf litter and crop residues. They are good fliers and can cover 50 km or more. | The overwintering weevils emerge in spring, feed on young cotton foliage and lay their eggs on flower buds or cotton squares, one per bud/square. The larvae feed on the flower buds or developing bolls and new adults emerge after about 3 weeks under favorable conditions. There may be up to 10 generations in one season. Infested squares/bolls drop to the ground. The adults overwinter in leaf litter and crop residues. They are good fliers and can cover 50 km or more. | ||
Revision as of 19:34, 5 September 2014
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Author(s): F. Benci, Boll Weevil Research Laboratory
Source: IPM Images
Anthonomus grandis Boheman, 1843 - (boll weevil)
is an important pest of cotton in Central and South America. It is suspected to be native to southern Mexico and Guatemala. It is found now in most areas of this continent where cotton is grown and was first recorded from the U.S.A. in 1892 and from Brazil in 1983. The weevil breeds in developing cotton bolls, effectively destroying the cotton. The spread of the weevil to the U.S.A. caused large-scale destruction of cotton crops in the beginning of the 20th century and the industry only slowly recovered through the development of pesticides like DTT. Even in the 1970s annual losses were still estimated at around US$ 200 million, with another US$ 75 million being spent on control effort. At that time about one third of all pesticides used in the U.S.A. where applied to cotton.
| Vernacular names | |
|---|---|
| • Deutsch: | Baumwollkapselkäfer |
| • English: | boll weevil cotton boll weevil |
| • Español: | picudo del algodonero picudo del algodón gorgojo de la cápsula del algodón |
| • Français: | charançon américain de la capsule anthonome du cotonnier |
| • Português: | bicudo-do-algodão |
Since 1978, the USDA Boll Weevil Eradication Program has succeeded in gradually eliminating the weevil from the cotton growing areas of the U.S.A., using pheromone traps, cultural methods (adjusting planting time and removing plant residues) and insecticide (mainly malathion) applications. By 2012/13, the weevil survived in only a small area of Texas and operations mainly focused on monitoring efforts to confirm eradication. Also efforts are shifting to the northern parts of Mexico to prevent re-infestation.
The overwintering weevils emerge in spring, feed on young cotton foliage and lay their eggs on flower buds or cotton squares, one per bud/square. The larvae feed on the flower buds or developing bolls and new adults emerge after about 3 weeks under favorable conditions. There may be up to 10 generations in one season. Infested squares/bolls drop to the ground. The adults overwinter in leaf litter and crop residues. They are good fliers and can cover 50 km or more.
The adult is around 5-6 mm long with the rostrum being about half as long as the body. The colour varies and is mainly brownish or greyish. It is densely covered with gray hairs and the pronotum has a whitish line along the middle. The front femur is swollen with double-pointed teeth on the inner margin.
For details see the respective page in Wikipedia.
- Other images of Anthonomus grandis (IPM Images and PaDIL - click to enlarge)
adult on a damaged cotton boll
larva and pupa in a cotton boll
details of head
posterior end
boll weevil trap
