우리나라 園藝作物의 主要天敵에 對한 生態 및 分布에 關한 硏究 : With Special Emphasis on Those to Pear Insects 배나무 害蟲 天敵을 中心으로 With Spectal Emphasts on Those to Pear Insects = Ecology and Distribution of Some Important Natural Enmies to the Harmful Insesects of Major Horticultural Crops in Korea
저자
崔福衍 (全南大學校 農科大學) ; 尹柱敬 (全南大學校 農科大學) ; 安奬淳 (全南大學校 農科大學) ; 金光秀 (全南大學校 農科大學)
발행기관
全南大學校 農漁村開發硏究所(INSTITUTE OF AGRICULTURAL SCIENCE & TECHNOLOGY CHONNAM NATIONAL UNIVERSITY)
학술지명
권호사항
발행연도
1979
작성언어
Korean
KDC
520.5
자료형태
학술저널
수록면
89-107(19쪽)
제공처
소장기관
With the purpose of study on the ecology and distribution of natural enemies of some harmful insects in major horticultural crops, harmful insects and their natural enemies were collceted from some pear orchards in Chonnam province and the ecological observaticons were made during March to December, 1978. Some important results are summarized as follows:
1. In the devastated pear orchads, Psylla pyrisuga Forster, Illibgris pruni Dyar, Stephantis nashi E. et T., Grapholitha molesta Busck, Cnidocampa flavescens Walker, and Nippolaehnus piri Mat. were the major insects found, whereas Pseudococcus comstocki Kuwana, Aphanostigma iakusiense Kishida, mites, and those belonging to Tortricidae, Aphididae and Carposinidae were the predomimant ones in the commercial pear orchards.
2. Insecticides most commonly sprayed to pear orchards were in the order of Parathion, Metasytox, Sevin, Sumithion, and Supracid.
3. The highest number (237) of the mummified larvae of Pseudoccous comstocki were found on the trunks about I metre high above the soil surface in the wintering trees, and also more than one mummies on the average were found from a fruit bag under storage.
4. Emergence of parasitic wasp was mostly occurred in the morning than in the after noon, and the period of emergence was less than 10 days in Allotropo burrelli and about 14 days in Pseudaphycus malinns.
5. Out of the larvae of P. comstocki examined from August 7 to November to November 7, 0.8% to 46.7% were mummified. Judging from the death ratio of the insects in the bags of damaged fruits on trees, the ratio of insects parasitized by natural enemies was estimated as 2.7% to 46.7%. The larvae of Kalodiplosis japonicus, a kind of fly were also substantially parasitized in certain cases.
6. Four species of parasitic wasps were collected from the larvae of P. comstocki, of which A. burrelli was the predominant one followed by P. malinus. The sex ratio was 2.2 to 1 for A. burrelli and 3.4 to 1 for A. malunus. The two other species were A. suvalbipes and A. convexiferous.
7. In order to control P. comstocke, 11 inscticides including Folithion and 6 Folithion mixtures containing DDVP and Supracid were tested. The surviavl ratios of natural enemies were very low in the plots of Metasystox, Paration, and DDVP with 0%-6.7% and 11.0% respectively compared to 84.7% of thecontrol plot. Those in the DDVP mixed with Lebaycid or Rouxon were alsovery low with 2.1% and 6.3% respectively.
8. Protolaelaps Pygmaeus, predatory white mities, was more widely distributed than the red mite, and parasitism to P.comstocki was very high with around 80%.
9. The spiders collected from the fruits during September to October were 63 belonging to 15 species of 6 families wheras those collected from the trees in November were 503 belonging to 32 species of 11 families. Erigonidium graminicola, as the predominant species, was 64.71% in September, 23.7% in Octovedr, and 41.52% in November, of the total spiders collected.
10. Other natural enemies belonging to 5 species of 3 families and 2 orders were also collected, but their parasitic ratio was insignificant.
11. Natural enemies were always found, regardless of the amount, whenever P. comstocki or A. iakusciense were severe, A. burrelliwas found without fail but P. mallinus was limitted to some caseses in the orchards with abandant P. comstocki, and P.pygmaeus was sure to occur where the damage by A. iaknsicense was severe. Therefore, A. burrelli and P,phgmaeus are considered to be the affective natural enemies to those two harmful insects in the pear orchards.
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