Study on Occurrence of
the Panicle Rice Mite, Steneotarsonemus spinki Smiley
in Tainan District and its Control
Survey on the 2 rice fields revealed that panicle rice mite Steneotarsonemus spinki Smiley was first observed in the leaf sheath in late growing stage of the 1st crop. Average mite numbers were 2.3 and 3.2 mites per tiller, respectively. In the 2nd crop, mite population of transplant rice field was observed before heading stage and density reached to highest level 4 weeks after heading with an average number of 141.0 mites per tiller. In the ratoon rice field, mite can be observed in all growth stage. The population increased to highest level at milky stage with an average number of 513.3 mites per tiller. Survey on 36 rice fields of 7 townships revealed that the 100% of panicle rice mite occurrence observed in the ratoon rice after 1st crop. Screening of miticides tested that 1000 dilution of 10% fenazaquin was the best with 99.1% of mortality followed by 1500 dilution of 1% milbemectin with 89.0% mortality. Granule tests indicated that 4% cartap, 10% terbufos, and 3% carbofuran were promising with 96.1%, 91.3% and 90.2% of mortality, respectively.
Keywords: Rice, Panicle Rice Mite,
Steneotarsonemus spinki Smiley, Ratoon Rice, Chemical Control
Accepted for publication: May 19, 2014