Evaluation of different control strategies against rootknot nematodes of kenaf (Hibiscus cannabinus L.)
1987
Mesfin Tessera Bekele
A factorial experiment was conducted in December, 1986 to May, 1987 to determine the effectivity of five control strategies in controlling Meloidogyne incognita on potted kenaf fertilized with three levels of urea. The control strategies used were the application of chicken dung (5 t/ha), sawdust (5 t/ha), neemcake (294 kg/ha), Paecilomyces lilacinus (Thom.) Samson (50,000 spores/ml) and phenamiphos 10 g (5 kg ai/ha). Pots treated with urea at the equivalent rates of 72 (N1), 102 (N2) and 132 kg/ha (N3) were used as control. All control strategies reduced root-knot nematode population, egg mass number per root and root galling, based on the comparison with the control. These strategies, except sawdust application, generally increased plant height, stalk diameter and top weight. Plants in sawdust treated pots were stunted and chlorotic. Root weight data were inconsistent and was believed not to be a good parameter in evaluating treatments effects on affected plants. A bioassay test manifested the potential of the extracts from chicken dung, sawdust, neemcake, P. lilacinus, phenamiphos and urea (N1-N3) to inhibit the hatching of the root-knot nematode eggs when compared with water as a control in a laboratory condition.
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