Studies on the effect of chemicals nematicidal against rice root-knot nematode, Meloidogyne graminicola development

Abstract

Experiment was conduct to study the effect of some Insecticides on plant growth and nematode multiplication. The observations (i.e. plant height, root length, weight of plant, number of galls, root population, egg population, soil population, total nematode population, and multiplication factor) revealed that all the plant growth and nematode multiplication parameter decreases in comparison to the uninoculated check and increases in comparison to the inoculated check. All the treatments were found significantly different from each other. The plant height, root length, weight of plant, number of galls, root population, egg population, soil population, total nematode population, and multiplication factor of nematode was significantly lower in all the treatment in comparison to treated check. The highest plant height, root length, Plant weight, and lowest number of galls, root population, egg population, soil population, total nematode population, and multiplication factor was recorded (20.50), (7.75), (1.98), (4.50), (13.00), (632.25), (892.25), (1537.50), (0.51) respectively in untreated check. The percent increase and decrease in all the parameters recorded was 14.81, 20.31, 23.44, 28.13, 10.94, 14.0618.1323.44,10.63, 13.4415.63 and 19.81percent plant height, 32.43, 41.31, 47.67, 64.20, 28.18,37.71, 46.61, 57.84, 15.89, 28.60, 40.25 and 50.42 percent in root length, 07.27, 12.73, 17.57, 20.00, 06.06, 11.51, 16.97, 19.93, 05.45, 10.91, 15.15, 18.18 and 07.27 percent in root weight, 62.64, 70.33, 79.12, 87.91, 59.34, 65.93, 74.73, 86.26, 57.14, 62.09, 73.08, 82.97 and 45.50 percent in number of gall 55.3, 64.15,77.07,87.32,50.00, 61.22, 71.71,84.88,46.59, 56.10,67.01, 81.95, 102.50 in root population, 71.86, 78.79, 89.22, 94.61,66.35,75.09,83.63,92.17,63.59,71.54,81.27,90.29, percent in eggs population, 52.99,64.33,72.03,77.10,49.56,62.03,69.95,76.48,64.44,57.47,66.16,73.76,percent in soil population, 67.08,75.11,84.89,90.23,67.46,74.76,80.17,88.24,59.24,67.96,77.44,86.15percent in total nematode population,67.05,75.05,84.95,90.29,62.29,71.81,80.19,83.38,59.24,68.00,77.52,86.10 percent in multiplication factor respectively.