Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Evaluation of some acaricides against leaf mite and sheath mite in rice.

Abstract

The efficacy of profenofos 50 EC (500 g a.i./ha), ethion 50 EC (500 g a.i./ha), propargite 57 EC (570 g a.i./ha), spiromecifen 240 SC (72 g a.i./ha), fenpropathrin 30 EC (150 g a.i./ha), milbemectin 1.0% (2.5 or 4.5 g a.i./ha) and dicofol 18.5 EC (500 g a.i./ha) against leaf (Oligonychus oryzae) and sheath (Steneotarsonemus spinki) mites in rice (cv. Vajram) was evaluated in Maruteru, Andhra Pradesh, India, during the kharif of 2003 and 2004. The acaricides were applied at 30 days after transplanting (DAT) against leaf mite, and at 65 and 80 DAT against sheath mite. All the acaricides except milbemectin 1.0% at 2.5 g a.i./ha were effective in the reduction of leaf mite population in 2003. The percent reduction in leaf mite density at 5 days after treatment was high with profenofos 50 EC (68.6%), followed by dicofol 18.5 EC (66.7%). In 2004, dicofol 18.5 EC recorded the highest percent reduction in leaf mite incidence (96.5%), followed profenofos (95.1%). In 2003, dicofol 18.5 EC and spiromecifen 240 SC registered the lowest sheath mite population (8.0 and 12.5/10 spikelets, respectively). In 2004, dicofol 18.5 EC, ethion 50 EC, propargite 57 EC and profenofos 50 EC resulted in the lowest number of sheath mites (10.3, 11.3, 14.0 and 17.5/10 spikelets). The highest grain yield in 2003 was obtained with fenpropathrin 30 EC (4677 kg/ha). In 2004, the grain yield did not significantly vary among the treatments.