Study on the efficacy of the entomopathogenic nematodes, Steinernema carpocapsae (Weiser), S. riobrave Cabanillas, Poinar and Raulston and S. siamkayai Stock, Somsook and Reid for controlling Lepidopterous larvae at different temperatures
2003
Vacharee Somsook(Department of Agriculture, Bangkok (Thailand). Plant Protection Research and Development Office. Entomology and Zoology Group) | Suthichai Somsook(Thammasat University, Bangkok (Thailand). Faculty of Science and Technology. Department of Agricultural Technology)
At 25 and 30 deg C, the effectiveness of S. carpocapsae and S. riobrave against larvae of each lepidopterous species was not significantly different, but they showed higher efficacy than S. siamkayai significantly. At 25 and 30 deg C S. carpocapsae and S. riobrave caused high mortality (86-100 percent) to S. litura, S. exigua and G. mellonella whereas S. siamkayai gave 60 and 72 percent mortality of S. litura and S. exigua, respectively, and only 18-46 percent infection of G. mellonella. At 25 deg C S. carpocapsae showed 68 percent mortality of H. armigera which decreased significantly at 30 deg C to 48 percent. Whereas S. riobrave at the increasing of temperature from 25 deg C to 30 deg C caused the significantly higher mortality from 60-92 percent, which was as high as the mortality rate of the susceptible group (S. litura, S. exigua and G. mellonella). S. siamkayai showed significantly different mortality of H. armigera at 25 deg C at 8 percent and 30 deg C at 24 percent. At 35 deg C S. capocapsae was not effective, while S. riobrave exhibited significantly higher efficacy against all larval species than S. siamkayai. The mortality rates of S. litura, S. exigua and G. mellonella caused by S. riobrave were 80, 96 and 94 percent, respectively (no significantly different from at 25 and 30 deg C). The mortality rates caused by S. siamkayai were 16, 18 and 2 percent, respectively, which were less than those at 25 and 30 deg C significantly. The mortality of H. armigera caused by S. riobrave was 56 percent and S. siamkayai was 4 percent which was less than those at 30 deg C significantly.
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Эту запись предоставил Kasetsart University