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Chemical control of phytonematodes of grapevine (vitis vinifera) Baghel P.P.S., Bhatti D.S. Department of Nematology Haryana Agricultural University, Hissar. Presented at Nematology Symposium held at Coimbatore, India in February, 1981 Abstract Four chemicals, viz. aldicarb (Temik 10-G), carbofuran (Furadan 3-G), fensulfothion (Dasanit 5-G), and phorate (Thimet 10-G) each @ 2,4 and 6kg a.i./ha were applied in basin area of nematode-infested grapevines (var. Perlette) to determine their comparative efficacy. Phytonematodes infesting grapevines included Meloidogyne, Pratylenchus, Helicotylenchus, Longidorus and Xiphinema (940 nematodes/kg soil). Apart from the lowest dose (2kg a.i./ha) of aldicarb, fensulfothion and phorate and fensulfothion @4 kg a.i./ha, all the doses of different chemicals used registered significant increase in yield over the control. Aldicarb @6 kg a.i./ha was found to increase yield by 26.1 per cent as compared to control. Highest reduction (71.4%) in nematode popluation was also observed at the highest dose of aldicarb. Production of higher number of Meloidogyne males in soil treated with aldicarb was noticed. A tendency in males to develop intersexes was also observed, indicating a phenomenon affecting normal development. Among all these chemicals, aldicarb @ 6 kg a.i./ha appears to be the most effective chemical for controlling nematodes associated with grapevines. On the basis of cost benefit ratio (1:3.6), application of aldicarb @ 6 kg a.i./ha can be advocated. Top | |
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