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http://dx.doi.org/10.5656/KSAE.2010.49.3.219

The Occurrence of Rice Leaf-folder, Cnaphalocrocis medinalis (Lepidoptera : Crambidae) in Suwon and its Responses to Insecticides  

Park, Hong-Hyun (Crop Protection Division, Department of Agricultural Biology, National Academy of Agricultural Science, Rural Development Administration)
Cho, Jum-Rae (Planning and Coordination Division, National Academy of Agricultural Science, Rural Development Administration)
Park, Chang-Gyu (Crop Protection Division, Department of Agricultural Biology, National Academy of Agricultural Science, Rural Development Administration)
Kim, Kwang-Ho (Crop Protection Division, Department of Agricultural Biology, National Academy of Agricultural Science, Rural Development Administration)
Goh, Hyun-Gwan (International Agriculture R&D Team, Technology Cooperation Bureau, Rural Development Administration)
Lee, Sang-Guei (Crop Protection Division, Department of Agricultural Biology, National Academy of Agricultural Science, Rural Development Administration)
Publication Information
Korean journal of applied entomology / v.49, no.3, 2010 , pp. 219-226 More about this Journal
Abstract
This paper presents the occurrence and damage characteristics of the rice leaf-folder populations in the paddy fields of Dangsu-dong, Suwon from 2004 to 2007, and also reports the insecticide response of rice leaf-folder populations, which were collected from 2005 to 2006 in Korea and Vietnam. Laboratory measurements of the head capsule width and body length data enabled the identification of the rice leaf-folder larva stages collected in the field. The rice leaf-folder population in Suwon from 2004 to 2007 has a clear pattern consisting of two different group: the low and high density years. During the low density years (2004 and 2006), only one adult peak was noted in late August, with the damaged-hill percent less than 10% in late July, and the damaged-leaf percent around 2% in September. In contrast, during the high density years (2005 and 2007), two adult peaks were noted in early August and mid-September, with the damaged-hill percent was around 30% in late July, and the damaged-leaf percent 15 to 30% in September, which was beyond the economic injury level of rice leaf-folder. High correlations existed between the occurrence of rice leaf-folder in late July and early August and damages to rice during September. Based on these results, we suggest that the information on the rice leaf-folder population monitored by the adult density or damaged-hill percent in late July and early August would be very useful for predicting the damages later in the season for aiding in decision-making for timely control. In addition, the regional populations of rice leaf-folder showed the similar responses to the insecticides tested: high susceptibility to IGRs (tebufenozide and methoxyfenozide) and organophosphates (chlorpyrifos-methyl, pyridaphenthion), but relatively low to cartap.
Keywords
Rice leaf-folder; Larva stage; Forecasting method; Insecticide response;
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