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Economic injury level of the cotton aphid, aphis gossypii glover(Hemiptera: Aphididae), on cucumber, cucumis sativus L., in greenhouses
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- Authors
- Advisor
- 이준호
- Issue Date
- 2004
- Publisher
- 서울대학교 대학원
- Keywords
- 목화진딧물 ; Aphis gossypii ; 시설오이 ; Cucumis sativus ; 진딧물 흡즙일수 ; cumulative aphid-days ; 경제적 피해수준 ; economic injury level
- Description
- Thesis(master`s)--서울대학교 대학원 :농생명공학부,2004.
- Abstract
- Economic injury level of cotton aphid, Aphis gossypii Glover (Hemiptera: Aphididae) was
developed for the cucumbers in greenhouses by conducting following experiments.
Experiments were conducted to determine damage of the cucumbers by A. gossypii at vegetative (5-
leaf plants) and vegetative-reproductive (10-leaf plants) growth stages. Two different factors,
aphid infestation densities and aphid infestation periods, were considered in the experiements.
At the vegetative stage, initial infestation densities were 2, 4, 6, 8 individuals/plant and
aphids were infested on the third leaf from the bottom of plant. Aphids were maintained for
three and five weeks, and excluded by insecticide treatment. At the vegetative-reproductive
stage, initial infestation densities were 10, 20, 30, 40 individuals/plant and aphids were
infested on the third leaf from the bottom of plant. Aphids were maintained for two, four and
five weeks, and excluded by insecticide treatment. Aphid densities were investigated weekly in
both experiments.
The percent loss of cucumber fruit production (fresh weight) increased with infestation density
and infestation period of aphids, which were measured by cumulative aphid-days (CAD). The
relationship between percent loss of fresh weight and CAD were Y = -0.0909 X + 1840.2 (r2 =
0.896) and Y = -0.072 X + 1296.1 (r2 = 0.7375) at vegetative and vegetative-reproductive stages,
respectively.
- Language
- English
- URI
- http://dcollection.snu.ac.kr:80/jsp/common/DcLoOrgPer.jsp?sItemId=000000056160
https://hdl.handle.net/10371/67570
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