• Title/Summary/Keyword: fall webworm

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Molecular Characterization of Apolipophorin-III in the Fall Webworm, Hyphantria cunea Drury

  • Kim, Hong-Ja;Lee, Sang-Dae;Seo, Sook-Jae
    • International Journal of Industrial Entomology and Biomaterials
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    • v.3 no.2
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    • pp.163-168
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    • 2001

  • We isolated and sequenced a cDNA clone corresponding to apolipophorin-III (apoLp-III) from the fall webworm, Hyphantria cunea. The cDNA for apoLp-III codes fer a 187-residue protein (561 bp) with a predicted molecular mass of 20 kDa. The calculated isoelectric point is 8.76. Multiple alignment analysis of the amino acid sequence revealed that H. cunea apoLp-III is most similar to that of Spodoptera litura (71.5% identity), followed by that of Manduca sexta (69.7% identity). They share five amphipathic $\alpha$-helices that are proposed to play a critical role in the binding of apoLp-III to lipophorin.

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Aerial Application Tests with Some Low toxicity Insecticides Against the Fall Webworm, Hyphantria cunea Drury (Lepidoptera: Arctiidae) (저독성약제(低毒性藥劑)를 이용(利用)한 미국흰불나방의 항공방제효과(航空防除效果))

  • Chung, Sang-Bai;Ko, Je-Ho
    • Korean Journal of Environmental Agriculture
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    • v.4 no.2
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    • pp.108-113
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    • 1985

  • Aerial application tests with a biological insecticide (Thuricide$^{(R)}$) and two low toxicity insecticides, Diflubenzuron (Dimilin$^{(R)}$) and Triflumuron (Alsystin$^{(R)}$) were carried out against the fall webworm (Hyphantria cunea Drury). For experimental application by helicopter, dilutions of 30x and 45x Thuricide, 180x and 240x Alsystin, and 180x Dimilin were utilized. The solutions were applied at a rate of 30 liters per hectare. The results are as follows: 1) All treatments, Dimilin 25% wp, Thuricide wp, and Alsystin 25% wp, were found to very effec tive against fall webworm larvae. Percentages of mortality averaged between 93.9% and 97%. 2) No significant differences in percentages of larval kill were found between dilutions of Thuricide (30x and 45x) or Alsystin (180x and 240x). 3) Assessment of parasite densities in the treated areas 35 days after treatment indicated that percentages of reduction for all five species found, including Brachymeria lasus(Walker) (=obscurata [Walker]), were lower than for areas treated with the conventional insecticide Diplox$^{(R)}$ (trichlorfon) 25% wp. In particular, the percentage of reduction in Thuricide-treated areas was only 21% as compared with the untreated (control) areas. 4) Aerial applications of Dimilin were very effective and economical for control of the fall webworm by comparison with [aerial] applications of Thuricide.

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Diapause-initiation Stage and Changes in Proteins of the Fall Webworm (Hyphantria cunea Drury) Pupae (흰불나방의 용휴면이 결정되는 시기와 용 체내단백질의 변화)

  • 박노중;부경쟁
    • Korean journal of applied entomology
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    • v.27 no.1
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    • pp.6-13
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    • 1988

  • Studies were carried out to investigate the diapause-sensitive stage, the effect of 20-hydroxye- cdysone on diapausing pupae and the changes in pupal proteins of the fitll webworm, HYPha¬ntria cunea Drury. The stage sensitive to diapause-inducing photoperiod lies between 5th and 15th day of the larval development. And the oxygen consumption rate of diapausebound pupae decreased to a mean level of $30mu$l $O_{2}$/g/hr. The 20-hydroxyecdysone was effective in raising the respiratory acivity of 2.5% homogenate of the diapausing fall webworm pupae and in causing a normal adult development of the diapause-bound pupae. The soluble protein content rapidly declined in normally-developing pupae, but in diapause-bound pupae it was more or less static with much higher quantity. And protein bands separated from fat body of diapause¬bound pupae were different from those of nondiapausing pupae.

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Nucleic Acid of the Fall Webworm, Hyphantria cunea Drury during its Development (미국흰불나방(Hyphantria cunea)의 核酸에 관한 硏究)

  • Yoo, Chong Myung
    • The Korean Journal of Zoology
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    • v.12 no.2
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    • pp.57-59
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    • 1969

  • 1. The amounts of RNA and DNA were determined in the fall webworm, Hyphantria cunea Drury during the course of development from the egg to early adult stage. 2. The amounts of both nucleic acids were increased with the development of egg. 3. Both acids reached a maximum druing the stage of the 5th instar larva. 4. The amount of RNA was generally greater than that of DNA throughout the stages of development. 5. As the pupa developed, there was an increase in the amount of RNA and on the contrary, the amount of DNA decreased.

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Research on the Distribution and Damage of the Fall Webworm Hyphantria cunea Durury (미국 흰불나방의 피해(被害)와 분포조사(分布調査))

  • Ko, Jeho;Lee, Sangok
    • Journal of Korean Society of Forest Science
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    • v.7 no.1
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    • pp.35-39
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    • 1968

  • 1. The Fall webworm, Hyphantria cunea was widely distributed ranging from Seoul to Kangnung, Yung-ju, Taegu, Iri and Kwang-ju in 1967. 2. Heavily infested tree species by the Fall webworm were Sycamore, Cherry, ash-leaved maple, poplar, and elm. 3. The average number of larval masses per damaged garden tree and roadside tree was 7.0 and 3.4 respectively. 4. Trees of 6-10m in height had most number of larval masses and were most heavily infested. 5. More larval masses were found in the median and lower parts than higher parts of the crown. 6. The ratio of damaged by second generation was 55% higher than by first generation. The ratio of damage by 3rd generation is 18% less than by first generation.

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