By S.S. Narwal, R.E. Hoagland, R.H. Dilday, M. J. Reigosa Roger
The speedily growing to be human inhabitants has elevated the dependence on fossil gasoline dependent agrochemicals resembling fertilizers and insecticides to supply the mandatory agricultural and forestry items. This has exerted an outstanding strain at the non renewable fossil gasoline assets, which can't final indefinitely. in addition to, indiscriminate use ofpesticides for pests (weeds, bugs, nematodes, pathogens) regulate has led to severe ecological and environmental difficulties viz. , (A) expanding occurrence of resistance in pest organisms to special insecticides. (B) Shift in pests inhabitants, particulary in weeds and bugs. In weeds, species which are extra heavily on the topic of the vegetation they infest have constructed. In bugs, state of affairs is such a lot grim, the predators were killed and minor insect pests became significant pests and require very heavy doses ofhighly poisonous pesticides for his or her regulate. (C) larger environmental pollutants and health and wellbeing risks (a) fairly from infection of floor and underground consuming water assets and (b) from their inhalation in the course of dealing with and alertness. (D) poisonous residues of insecticides pollute the surroundings and should end up unsafe to even our destiny generations. (E) a few agricultural commodities might include minute amounts ofpesticides residues, with lengthy tenn adversarial results on human and farm animals future health. for this reason, severe ecological questions on the reliance on insecticides for pests keep an eye on has been raised. using fertilizers, along with inflicting environmental difficulties has additionally impoverished the soil health and wellbeing and lowered the necessary soil fauna. for instance, in a few significant crop rotations viz.
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Additional info for Allelopathy in Ecological Agriculture and Forestry: Proceedings of the III International Congress on Allelopathy in Ecological Agriculture and Forestry, Dharwad, India, 18–21 August 1998
7, pp. 130. 83. D. K. (1978). Effect of soil amendments on nematodes and crop yields. II. Oilsed cakes, organic matter and inorganic fertilizers at different levels of Meloidogyne incognita. Indian Journal ofEntomology 40: 42-53. 84. N. N. (1955). Secretion of toxic substances of alfalfa and their effect on cotton and soil microflora. Akad. Nauk USSR Izvestiya Ser. Biologia 6: 3-9. 85. B. M. (1962). Effect of summer fallowing on the root lesions nematode (Pratylenchus penetrans Cobb) and yield of flue-cured tobacco in Ontario.
FACKNATH* and B. LALLJEE Faculty ofAgriculture, University ofMauritius, Reduit, Mauritius Abstract There are various strategies of allelopathic interactions, which help in reducing population of plant pests, the most popular being the 'Botanical Pesticides'. Such plant allelochemicals possessing pesticidal properties constitute a transition bridge between synthetic pesticides on one hand and totally natural pest control on the other. This aspect of allelopathy can be exploited in different ways: (i) A large number of tropical plants, having pest control properties have been studied and in a few cases the biologically active groups or principles have been commercialised.
Crop rotation is one of the natural methods of disease prevention especially when botanically unrelated crops are included as they are affected by different pathogens. Crop rotation helps to control many soil borne diseases such as mosaic, wilt of legume crops (pigeonpea, pea, chickpea) and linseed, red rot and wilt in sugarcane, ergot and smut in pearlmillet, leaf smut and bunt in rice, bunt and molya disease in wheat and barley and root rot in Allelopathy in ecological agriculture 25 vegetable crops.
Allelopathy in Ecological Agriculture and Forestry: Proceedings of the III International Congress on Allelopathy in Ecological Agriculture and Forestry, Dharwad, India, 18–21 August 1998 by S.S. Narwal, R.E. Hoagland, R.H. Dilday, M. J. Reigosa Roger