Effects of Soil and Foliar Application of Neem Products on Densities of Rice Yellow Stem Borer, Scirpophaga incertulas (Walker) Egg Masses and their Parasitism
Field experiments were conducted to study the effects of soil and foliar application of certain neem products on the densities of egg masses of the yellow stem borer, Scirpophaga incertulas(Walker) (Lepidoptera: Pyralidae), and on the extent of egg parasitism due to Telenomus dignus (Gahan) and Tetrastichus schoenobii(Ferreira). NPK fertilizers and organophosphate insecticides were included for comparison. The egg mass numbers and their parasitism were assessed at fortnightly interval. The results indicated that the egg masses were more numerous in NPK plots (2.16/m2) than in neem cake plots (1.10/m2), while the parasitism was higher on plants sprayed with neem products+fish oil rosin soap (26.28%) in neem cake plots than on plants with no plant protection in NPK plots (20.92%).
Egg Masses, Egg Parasitism, Neem Products, Rice YSB.
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