proved effective in checking the bollworm infestation. Using mulches to smother weeds and providing row covers to protect plants from insects are other examples. Biological controls These include augmentation and conservation of natural enemies of pests such as insect predators, parasitoids, parasitic nematodes, fungi and bacteria. In IPM programs, native natural enemy populations are conserved, and non-native agents may be released with utmost caution. Trichogramma spp. is the most popular parasitoids being applied on a number of host crops. A number of microorganisms such as Trichoderma spp., Verticillium spp., Aspergillus spp., Bacillus spp. and Pseudomonas spp. that attack and suppress the plant pathogens have been exploited as biological control agents. Chemical controls Pesticides are used to keep the pest populations below economically damaging levels when the pests cannot be controlled by other means. Pesticides include both the synthetic pesticides and plant derived pesticides. Synthetic pesticides include a wide range of man-made chemicals. These are easy to use, fast-acting and relatively inexpensive. Ideally, pesticides should be used as a last resort in IPM programs because of their potential negative effect on the environment. Pesticides with the least negative impacts on non-target organisms and the environment are most useful. Fortunately, new generation pesticides with novel modes of action and low environmental effects are being developed and registered for use. Pesticides that are short-lived or act on one or a few specific organisms fall in this class. Assessment of Economic Threshold This is based on the concept that most plants can tolerate at least some pest damage. In an IPM program where the economic threshold is known, chemical controls are applied only when the pest’s damaging capacity is approaching the threshold, despite application of other alternative management practices. Use of Botanical Pesticides These can be prepared in various ways. They can be as simple as raw crushed plant leaves, extracts of plant parts or as complex as chemicals purified from the plants. Pyrethrum, neem, tobacco, garlic, and pongamia formulations are some examples of botanicals. Some botanicals are broad spectrum pesticides. Botanicals are generally less harmful to the environment, because of their quick degrading property. They are less hazardous to transport. The major advantage is that these can be formulated on-farm by the farmers themselves. Criteria for Pesticide Selection and Use
proved effective in checking the bollworm infestation. Using mulches to smother weeds and providing row covers to protect plants from insects are other examples. Biological controls These include augmentation and conservation of natural enemies of pests such as insect predators, parasitoids, parasitic nematodes, fungi and bacteria. In IPM programs, native natural enemy populations are conserved, and non-native agents may be released with utmost caution. Trichogramma spp. is the most popular parasitoids being applied on a number of host crops. A number of microorganisms such as Trichoderma spp., Verticillium spp., Aspergillus spp., Bacillus spp. and Pseudomonas spp. that attack and suppress the plant pathogens have been exploited as biological control agents. Chemical controls Pesticides are used to keep the pest populations below economically damaging levels when the pests cannot be controlled by other means. Pesticides include both the synthetic pesticides and plant derived pesticides. Synthetic pesticides include a wide range of man-made chemicals. These are easy to use, fast-acting and relatively inexpensive. Ideally, pesticides should be used as a last resort in IPM programs because of their potential negative effect on the environment. Pesticides with the least negative impacts on non-target organisms and the environment are most useful. Fortunately, new generation pesticides with novel modes of action and low environmental effects are being developed and registered for use. Pesticides that are short-lived or act on one or a few specific organisms fall in this class. Assessment of Economic Threshold This is based on the concept that most plants can tolerate at least some pest damage. In an IPM program where the economic threshold is known, chemical controls are applied only when the pest’s damaging capacity is approaching the threshold, despite application of other alternative management practices. Use of Botanical Pesticides These can be prepared in various ways. They can be as simple as raw crushed plant leaves, extracts of plant parts or as complex as chemicals purified from the plants. Pyrethrum, neem, tobacco, garlic, and pongamia formulations are some examples of botanicals. Some botanicals are broad spectrum pesticides. Botanicals are generally less harmful to the environment, because of their quick degrading property. They are less hazardous to transport. The major advantage is that these can be formulated on-farm by the farmers themselves. Criteria for Pesticide Selection and Use
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