Rice thrips infestation in West Bengal
1987
Chatterjee, P.B. (Rice Research Station, Hooghly, West Bengal (India))
Rice thrips, Stenchaetothrips biformis (Bagnall) is essentially a pest of young rice plants. On wetland or monsoon season rice (kharif), maximum infestation is found Jul-Aug when rice is in nursery beds or at tillering in the field. However, a severe outbreak occurred at late tillering in West Bengal in Sep 1986. An estimated 60,000 ha was affected. A prolonged dry spell from Aug to the third week of Sep in the middle of the rainy season may have been one of the causes. Another thrips species, Haplothrips ganglbaueri Schmutz, commonly known as rice ear thrips, damages the inflorescence of early varieties. It is polyphagous and has been recorded on other crops. On rice, adults and nymphs congregate on the emerging inflorescence, lacerate the lemma and palea of the spikelet, and suck the content. Symptoms include ear distortion and spikelet whitening and sterility. H. ganglbaueri has been found in Hooghly, Midnapore, Burdwan, and 24 Parganas districts of West Bengal. On wet season rice, damage occurs Sep-Oct on dry season rice, maximum thrips concentration occurs in Mar-Apr.
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