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31
Jul

Practices to increase activities of natural enemies

1. Certain weeds in rice environment are infested with insects that alternatively support rice pest parasitoids in off-season. Nanophyes sp. on Ammania baccifera L. a weed in rice fields have been identified as a reservoir host supporting parasitoids like Neanastatus cinctiventris Girault on gall midge, Trichomalopsis sp. on Pelopidas mathias (Fabr.). 2. Besides, predating directly on rice pest
31
Jul

Parasitoids of Leaf folder:

1. Cnaphalocrocis medinalis is the most important leaf folder species of rice crop and is attacked by a large number of natural enemies. 2. Diversification of natural enemies and the extent of their activities appear to be more in rainy season crop than in summer, which possibly restrict the activity of the pest in kharif as compared to rabi. 3. Inundative releases of Trichogramm
31
Jul

Parasitoids of Gall midge

1. The egg-larval parasitoid, Platygaster oryzae (Cameron) has been recognized as one of the important parasitoids of GM and parasitism reached up to 93% during October-November. 2. Mummies of P. oryzae were found in the upper portion of the silver shoots in the rainy months and in lower portion in dry months. 3. P. oryzae and Platygaster sp. occur in fairly large number in the field, but parasit
31
Jul

Parasitoids of Brown planthopper (BPH)

1. Egg parasitism is often very high, whereas nymph and adult parasitism are generally low. 2. Egg parasitoids exert considerable control over BPH population. Among three common egg parasitoids, Anagrus optabilis (Perkins), Oligosita naias (Girault) and Tetrastichus sp. recorded 42% cumulative parasitism in Tamil Nadu. 3. Anagrus sp. and Oligosita sp. were also the common species at Cuttack
31
Jul

Parasitoids of Yellow Stemborer (YSB)

1. The Egg parasitoids of yellow stem borer are Telenomus dignoides (Nixon), T. rowani Gahan, T. dignus Gahan, Tetrastichus schoenobii (Ferr.) and Trichogramma japonicum (Ashm.) are quite effective in controlling the pest population. 2. T. dignoides is the most frequent, widely distributed and effective parasitoid of all. The extent of cumulative egg mass parasitism due to all the egg parasitoids
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