Abstract:
In Pakistan the cotton is grown during the hot summer monsoon season. This provides a most congenial environment for the reproduction and rapid increase of the various insect-pest complexes which attack the cotton crop at different growth stages and inflict heavy losses. The sucking pest complex, consisting of thrips, jassid and whitefly, usually appears early in the season from May to June although infestation can be observed upto September. The bollworm complex, pink bollworm and two species of spotted bollworms, appear mid-season and increase rapidly as the temperature falls slightly during mid-August to Mid-October at the time to maximum fruit setting. Furthermore, where both early and late maturing cotton varieties are sown, the different pest complexes can overlap, causing very severe damage to the crop. To save the cotton crop from the ravages of these marauding pests a variety of organic pesticides belonging to different chemical groups, organocholorines, organophosphates, carbonates and pyrethroids, are recommended for use. While some of these insecticides are broad spectrum and can control more than one target insect-pests. At the same time, some products containing mixtures of two or more pesticides are also available.
Page(s):
59-64
DOI:
DOI not available
Published:
Journal: Pakistan Cotton, Volume: 30, Issue: 1, Year: 1986