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Indian Journal of Nematology
Year : 1986, Volume : 16, Issue : 2
First page : ( 216) Last page : ( 221)
Print ISSN : 0303-6960.

Influence of some weed control practices and rabi crops on nematode population behaviour*

Gaur H.S., Haque M.M.

Division of Nematology, Indian Agricultural Research Institute, New Delhi-110 012

* Contribution No. Nem/516/86 of Division of Nematology, IARI, New Delhi.

Accepted:  February,  1986.


Results of factorial experiments conducted in 2.25 m2 field microplots, over two years revealed that the influence of crop on nematode population was more pronounced than that of weed control practices. The mustard crop, in general, maintained lower equilibrium population of plant-parasitic nematodes than wheat, pea or fallow. The mechanical weed control was the best in keeping down the weed den. sities as well as nematode populations followed by pre-emergence and post-emergence weedicides (Hnuron and tribunil @ 0.5 kg a.i./ha). Lack of weed control led to populations as high as obtained under wheat or pea crops. The interaction effect of weed control practices and crops was not significant except in April, 1984 when mustard recorded lowest populations with any of the weed control practices. Mechanical weed control had similar effect on nematodes in all crops. With pre-emergence weedicide, wheat recorded highest populations followed by pea while with post-emergence weed icide, fallow had highest populations followed by wheat and pea. Without weed control the highest population buildup was observed under fallow and wheat and least in mustard. The post-emergence weedicide application was more effective in reducing the semi-endoparasite, Rotylenchulus renijormis, whereas the pre-emergence application caused slightly greater reduction of ectoparasites like species of Tylenchorhynchus. Weed control, mechanically or by pre-emergence weedicide, gave higher yields of wheat and mustard while the post-emergence weedicide and mechanical method gave higher yield of pea.


Key words

Population dynamics, Crops, Weed control practices.


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