• Title/Summary/Keyword: oriental tobacco budworm

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Food Attractancy of the Oriental Tobacco Budworm, Heliothis assulta, Larvae (담배나방(Heliothis assulta)유충의 먹이 유인성)

  • 최광식;부경생
    • Korean journal of applied entomology
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    • v.28 no.2
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    • pp.88-92
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    • 1989

  • The Oriental tobacco budworm, Heliothis assulta (Guenee), larvae usually feed on the hot-pepper fruits and young tobacco leaves or buds in Korea. This experiment was conducted t(} compare their attraction to their host plants including fruits of the sweet-pepper and solanum uk kwang, besides the other two mentioned above. First instar larvae were most attracted to the hot-pepper fruits. Flowers or leaves of the hot pepper plants were not attractive either. When the hot-pepper fruits were compared for attractancy, based on developmental stages, relatively mature fruits, just before ripening, were the most attractive. Their extract with or without 10% ethanol also gave similar result to 1st instar larvae or 2~4 instar larvae, suggesting a possibility that there is an attractant(s) in the hot-pepper fruits.

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Change in Protein and Carbohydrate Contents in Diapausing and Non-diapausing Pupae of the Oriental Tobacco Budworm, Heliothis assulta Guenee (담배나방 휴면용과 비휴면용의 단백질과 탄수화물의 변화)

  • 조국호;부경생
    • Korean journal of applied entomology
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    • v.29 no.4
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    • pp.286-293
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    • 1990

  • Studies were carried out to investigate the change in protiens and carbohydrates from diapausing pupae of the Oriental tobacco budworm, Heliothis assulta Guenee. The oxygen consumption rate of non-diapausing pupae through the whole pupal period showed an U-shaped curve, while that of diapausing pupae decreased to a mean level of 20$\mu$1/g/hr. But the rate of oxygen consumption increased in diapausing pupae before their emergence. The body weight of diapausing pupae showed almost no change during 12 days after pupation. The total contents of major carbohydrates and soluble proteins were higher in diapausing pupae than those in non-diapausing pupae and the change in carbohydrate and protein contents was more dynamic in non-diapausing pupae than that of diapausing pupae. the electrophoretic band patterns of proteins were similar in both of diapausing and non-diapausing pupae. Diapausing pupae increased their haemolmph osmolarity further when they were exposed to low temperatures.

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Morphology and Biochemcial Characteristics of a Nuclear Polyhedrosis Virus Isolated from the Oriental Tobacco Budworm, Helicoverpa assulta (Guenee) (담배나방 핵다각체병바이러스의 형태 및 생화학적 특성)

  • 진병래;박현우;우수동;김우진;김우진;박범석;강석권
    • Korean journal of applied entomology
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    • v.34 no.3
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    • pp.218-223
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    • 1995

  • A nuclear polyhedrosis virus isolated from the oriental tobacco budworm larvae, Helicoverpa assulta (Guenee) was characterized by electron microscopy, SDS-PAGE, restriction endonuclease analysis and cross infectivity. The shape of a polyhedron was $1.0\mu\textrm{m}$ in average with icosahdral outline, and the virus particle was $65nm\times300nm$ in average with rod-shape. The nuclear polyhedrosis virus was contained a single nucleocapsid within a viral envelope embedded in a polyhedron. The polyhedral protein was composed of a single polypeptide with a M.W. of 31 Kd. The genome size of the virus by restriction endonuclease analysis was about 120 Kb. Among several nuclear polyhedrosis viruses, the nuclear polyhedrosis virus from Helicoverpa assulta (HaNPV) and Autographa california nuclear polyhedrosis virus (AcNPV) were infected the oriental tobacco budworm larvae.

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Survival and Development of Overwintering Pupae of the Oriental Tobacco Budworm, Helicoverpa assulta, from Different Locality (담배나방 월동번데기의 지역간 발육특성 비교)

  • 한만위;이준호
    • Korean journal of applied entomology
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    • v.37 no.2
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    • pp.127-135
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    • 1998

  • To study overwintering biology of the oriental tobacco budworm (OTB), Helicoverpaa.ssulta, OTB larvae were collected from middle and southern region of Korea in the autumn and rearedto diapausing pupae. Diapausing pupae were held at two different locations (Suwon and Chinju) and wererecollected in the spring to observe adult emergence rate and duration to adult emergence at 25$^{\circ}$C. Thesurvivorship of overwintering pupae was less than 5% when the pupae were buried in the soil in 20cmdepth. However, more than 60% of the pupae survived when they were kept in the plastic cup withartificial diet and were buried in the soil. The mean developmental periods of overwintering pupae at 25"C varied from 20.4 days to 43.9 days depending on years and locations where larvae were collected andpupae were held. The proportion of individuals which required longer than 30 days for development washigher in the population from the middle regions than those of southern regions. However, the proportiondecreased when the pupae collected from middle regions were held at Chinju, southern region. Chinju, southern region.

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Initiation and Termination of Pupal Diapause in the Oriental Tobacco budworm (Heliothis assulta) (담배나방 (Heliothis assulta) 용휴면의 유기와 종료)

  • 부경생;신현철;한만위;이문홍
    • Korean journal of applied entomology
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    • v.29 no.4
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    • pp.277-285
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    • 1990

  • Laboratory and field studies were conducted to investigate the initiation and termination factors for pupal diapause in the Oriental tabacco budworm, Heliothis assulta Guenee. Diapause induction was dependent of photoperiod and temperature experienced by 4th and 5th instar larve. One hundred percent of pupal diapause was obtained when larvae were grown at 10L/14D or shorter and $20^{\circ}C$. But at $25^{\circ}C$ the maximum rate of diapause was only about 85% at 8L/16D, the shortest photoperiod tested in this experiment. Adults, eggs or pupae did not respond to diapause-inducing environmental conditions. The critical photoperiod was 12-12.5 hr at $25^{\circ}C$and 14-14.5 hr at $20^{\circ}C$. In the field-collected sample 100% of diapuse rate was observed on Sept. 20 and thereafter in Suwon and middle part of Korea. Cold temperature treatment was not necessary in the termination of pupal diapause, but accelerated adult development.

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