Root nematodes, Hirschmanniella spp., incidence on rice Oryza sativa L. in Laguna Province [Philippines] yield loss due to infection control with nematicides
1988
Vinod Kumar, M.
Results of the study revealed that rice root nematode, Hirschmanniella oryzae and H. mucronata are prevalent and widely distributed in Laguna Province [Philippines]. H. oryzae is more common. Both species are found in same locality. Field population distribution of both species are heterogeneous in same locality. The two species differ in their morphology and morphometrics. Distribution of H. oryzae in different regions of rice root differed at different stages of growth. Inoculum levels of 10,000 and 25,000 nematodes per pot significantly reduced fresh top weight, root weight, and grain yield of rice. Panicle emergence was also delayed at these inoculum levels. Apache 10 g showed significant increase in growth of rice plants in microplots. All three nematicides and rates except Mocap 10 g, 1 kg ai/ha significantly increased grain yield of rice in microplot. Apache 10 g gave highest grain yield. For all the three nematicides application, rate of 2 kg ai/ha was better than 1 kg ai/ha. Apaches 10 g at 2 kg ai/ha gave the highest increase in grain/straw yield of rice in field condition.
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