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http://dx.doi.org/10.5656/KSAE.2009.48.2.165

Head Capsule Width and Population Densities of Overwintering Nymphal Stages of the Green Rice Leafhopper, Nephotettix cincticeps Uhler (Hemiptera: Cicadellidae)  

Kang, Seok-Min (Department of Rice and Winter Cereal Crop, NICS, RDA)
Paik, Chae-Hoon (Department of Rice and Winter Cereal Crop, NICS, RDA)
Lee, Geon-Hwi (Department of Rice and Winter Cereal Crop, NICS, RDA)
Choi, Man-Young (Applied Entomology Division, NAAS, RDA)
Sengottayan, Senthil-Nathan (Division of Biopesticides and Environmental Toxicology, Sri Paramakalyani Centre for Environmental Sciences, Manonmaniam Sundaranar University)
Hwang, Chang-Yeon (College of Agriculture and Life Sciences, Chonbuk National University)
Publication Information
Korean journal of applied entomology / v.48, no.2, 2009 , pp. 165-170 More about this Journal
Abstract
This study was conducted to investigate specific stages and distribution of overwintering nymphs of green rice leafhopper, Nephotettix cincticeps by measuring head capsule width. The nymphal head capsule width of the 1st instar to the 5th instar was 0.381, 0.502, 0.673, 0.979 and 1.128 mm, respectively. lts coefficient variation was 5.3, 4.0, 3.0, 4.5 and 5.3%, respectively. Growth ratio of each instar was not significantly different among 2nd to 4th instars as 1.31 to 1.34, but for the 5th instar it decreased as 1.28. The logarithm of the nymphal head capsule width was regressed as a function of the stage number of insects, resulting in LogY = 1.4627 + 0.1192X ($r^2= 0.9993$). Also fitness to the Dyar's law for the nymphal head capsule width of each instar was 98% or over and the Dyar's constant (K) was 1.316. The occurrence of N. cincticeps was maximum at the end of January with 195 individuals/0.25 $m^2$. The most abundant instar in the overwintering N. cincticeps population was 4th instar accounting for over 90%. Population of the 5th instar began to increase from mid-March, and adults began to occur in early April.
Keywords
Head capsule width; Nephotettix cincticeps; Overwintering; Insect stages; Population;
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