Survey of Percentage of Infective Planthopper, Laodelphax striatellus (Fallén), Transmitting the Rice Stripe Virus, in Kyushu
1969 Volume 15 Pages 90-91
Details
1969 Volume 15 Pages 90-91
From 103 stations in various area in Kyushu, the small brown planthopper of the first generation, adults and larvae of the 4 th and 5 th instar, were collected. Infectivity was tested individually by hemagglutination.
In southern Kyushu, Kagoshima and Miyazaki Pref., where the virus disease occurs slightly, the percentages were mostly lower than 2 to 3%. In northern Kyushu, Fukuoka, Nagasaki and Oita Pref., the percentages were higher than 5%, where the occurrence of the disease was economically important.
Percentage of infected hills in each station was surveyed in the late August. Correlation between the percentage of infective planthoppers and of infected hills was shown in Fig. 1. Percentage of infective planthopper in the stations where infected hills were over 10%, an economic loss level, exceeded 5.5%. These areas were considered to be virus-prevailing areas.
