South Asian Journal of Experimental Biology, Vol 2, No 4 (2012)

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Jul 15
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Evaluation of Achook (Azadirachtin 1500ppm) against root knot nematode (Meloidogyne incognita) infecting okra

Matiyar Rahaman Khan, Rajendra D. Solanki, Burhanuddin Bohra, B. N. Vyas

Abstract


Evaluation of different doses of Achook (1500 ppm azadirachtin EC) against Meloidogyne incognita (RKN‐Mi) infecting okra (Abelmoschus esculentus Moench.) was undertaken under net house and open‐field conditions. Results of pot (10cm dia) experiment showed that soil drenching of Achook and Achook A1 (contains sesame oil) at higher dosage (≥10litre/ha) showed reduced root galling, greater suppression of final soil nematode (J2) population and increased shoot height of okra. The single drenching of Achook andAchook A1 at 5 litre/ha at 15 days after sowing (DAS) immediately after appearance of first gall was also quite effective for managing the RKN‐Mi on okra. Results from open‐field testing of Achook EC showed efficacy to control RKN‐Mi. The Achook and Achook A1 formulations at 5 litre/ha as single application after with the appearance of first gall was found to be most effective for reduction of root galling, soil nematode population (63 to 67%), increasing shoot height and improving (20 to 23%) fruit yield of okra. Further, at all dosages both formulations showed nematode control efficacy and enhancement of crop yield. The Achook A1 was found to be more effective (38%
more yield) than soil application of carbofuran 2kg a.i./ha and neem cake at 1000kg/ha. Considering incremental cost benefit ratio (ICBR), the Achook (ICBR~4.23) and Achook1 (ICBR~4.03) at 5 litre/ha as a single soil drench with the appearance of root galling in okra was found to be the most economical. This was followed by Achook1 at 2.5 litre /ha as soil drench twice (7 DAS and 30 days after first drench) and Achook A1 5litre and 10litre/ha. The Achook A1 was found to be relatively more effective than that of carbofuran at 2kg a.i./ha and neem cake at 1000kg/ha.

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