|Title:||稻細蟎之發生與氣象關係及其防治研究||Other Titles:||Studies on the Occurrence of Rice Tarsonemjd 1ite (Sfeneotarsonemus spinki) in Relation to Mete rologieal Factors and its Control||Authors:||方新政
|Keywords:||稻細蟎||Issue Date:||Dec-1984||Publisher:||農業試驗所||Related Publication(s):||稻作區域性與期作性低產及增產措施之研究||Start page/Pages:||241-250||Source:||農業試驗所特刊;第16號||Abstract:||
Since 1976, because of the abrupt occurrence of rice sterility, the rice tarsonemid mite (Steneotarsonemus spinki) was recognized as the main factor causing rice sterility. According to the investigation, the annual population was usually very high since then. However, the population declined and the rice sterility occurred only limited in some areas in 1979. The reason remained unknown. In 1978, an investigation was made to detect the relationship between the occurrence of rice tarsonemid mite, rice transplanting stages, and meteorological factors. It was found that the meteorological factors were different in 1978 and 1979. It was postulated that meteorological factors were probably the main factor influening the occurrence of tarsonemid mite.
According to the data collected from the meteorological station near the experimental field, it showed that from the middle of April to June in 1978, the average temperature was 2-3℃ higher than that of the same period in 1979. The relative humidity year around in 1978 was also higher than that of 1979. The relative humidity from late April to July, the critical time for the occurrence of tarsonemid mite was particularly different between these two years. The precipitation was also different particularly; the rainy season in 1978 was thus obtained.
So far, no other host for rice tarsonemid mite was found. After second crop of rice was harvested, egg, larva or adult tarsonemid mites were found to overwinter on the unharvested living rice plant until the next Feburary, and would not migrate to the nearby rice seedlings. Air-borne rice tarsonemid mites were first found in early May, and were found on rice plants at one and one half month later in 1979.
Because of low population of the rice tarsonemid mites in 1979, the effect of five tested chemicals were found not different significantly. However, 47% ethyl parathion
E. C. was the most effective, followed 50% methyl parathion E. C. Two applications of 47% ethyl parathion E. C. at the rate rate of 1: 1000 started from the initial booting stage, with 14 days of meterval could effectively inhabit the population increase of rice tarsonemid mite.
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