• Proceedings of the Korean Society of Applied Entomolohy Conference
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• 2001.11a
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• pp.59-59
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• 2001

• Korean journal of applied entomology
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• v.44 no.4 s.141
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• pp.337-339
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• 2005

In Iksan, Korea, Parnara guttata Brener et Grey spend three generations per year, 1st generation adult emerged mid to late May from pupa developed from overwintered larva in weeds on bank around rice paddy field or on hillside and moved to rice paddy field to lay eggs on leaves of rice. The damage to rice by 2nd generation larva began to increase late July and reached peak from mid to late August. The 3rd generation adults were observed early to mid September and flew away from rice paddy field. There was significant relationship between the transplanting time and the occurrence of P. guttata in rice paddy fields. P. guttata preferred the rice transplanted in late season in paddy field. Insecticide treatment on late July about a week before the peak larval occurrence reduced the damage by P. guttata up to 91.2%, whereas the treatment on early August was a lot less effective reducing only 57.2% of the damage.

• Proceedings of the Korean Society of Applied Entomolohy Conference
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• 2002.11a
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• pp.59-59
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• 2002

• The Korean Journal of Pesticide Science
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• v.6 no.4
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• pp.257-263
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• 2002

This study was carried out not only to investigate the toxicities of 12 registered insecticides on different developmental stages, but also to determine the sublethal effects on longevity and reproduction of newly emerged adult female and development of the next generation in the rice skipper, Parnara guttata. Fenitrothion, fenthion, cartap hydrochloride, ethofenprox highly suppressed egg-hatch. All insecticides treated showed high larvicidal activity on the 1st to 2nd instar larva. The insecticides showed higher larvicidal activities on the 5th instar larva were fenitrothion, fenthion, ethofenprox, fipronil, methoxyfenozide, tebufenozide and Bt. var. kurstaki. The sublethal doses of fenthion, tebufenozide, cartap hydrochloride, methoxyfenozide, ethofenprox, imidacloprid and fipronil shortened the longevities of newly emerged adult female from the treated larva ($3{\sim}4$ instar). BPMC, imidacloprid, ethofenprox, fipronil and methoxyfenozide delayed the preoviposition periods of adult females and decreased the number of eggs laid when they were treated at the larval stages of the previous generation. Ethofenprox caused severe sublethal effects on P. guttata offspring, completely blocking the production. All insecticides except fenitrothion affected the egg viability, and all eggs from the adult females emerged from the survivors treated larvae with imidacloprid or fipronil fail to hatch. IGRs, methoxyfenozide and tebufenozide showed an adverse effect on the development of next generation larva.

• Korean journal of applied entomology
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• v.42 no.4
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• pp.323-327
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• 2003

Morphological characteristics and life cycle of Parnara guttata were studied from 2001 to 2002. Egg was hemisphere-shaped in pink. Larva was milky white or yellowish green color with 2.9-30.6 nm body length, depending on their developmental stages from 1 st to 5th instar. Pupa were grayish brown from 23.8 to 25.7 nm length, adults were yellowish brown color and body lengths were 17.4 nm and 16.2 nm and wing expanse lengths were 35.2 nm and 30.6 nm with female and male, respectively. At 25${\pm}$2$^{\circ}C$, each developmental periods was 4.5, 30.2, and 6.9 days with egg, larvae, and pupae, respectively. Also adult longevity were 10.1 for female, average number of egg was 205.5.