リンゴ園における害虫類の発生予察

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書誌事項

タイトル別名
  • Forecasting the Outbreak of Destructive Insects in Apple Orchards
  • リンゴエン ニ オケル ガイチュウルイ ノ ハッセイ ヨサツ 4
  • IV. On the Time of Emergence of the First Brood Moth of the Peach Fruit Moth, <i>Carposina niponensis</i> WALSINGHAM
  • IV. モモシンクイガ第1化期成虫の出現期について

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The peach fruit moth, Carposina niponensis WALSINGHAM, is one of the most destructive pests in sapple orchards and to protect fruits from the egg deposition, every fruit is covered with a small paper bag in Aomori Prefecture. As there are no suitable ways to kill the larvae of this moth entering into the fruit it is very important to restrain the ovi-positional activity. For this purpose, some investigations were carried out to forecast the time of emergence of the first brood moths based on the data from 1951 to 1960. The results obtained are summarized as follows:<br>1. The emergences of moths throughout the entire season are shown in a curve of 2-peaks in Tsugaru district in Aomori Prefecture, and as a rule, the moths of the first brood appear from mid- to late June and those of the second brood occur from early to mid-August.<br>2. The first moths begin to appear in early June, and the period from the initial date to 50 per cent of emergence lasts about 10 to 17 days.<br>3. Examining the relation between the temperature and the time of emergence of the first brood moths, it was found that there is a high correlation, especially between the temperatures during the period from April to late May and the initial, 5 per cent and 50 per cent dates of the moth appearance.<br>4. Considerably, high correlations were calculated between the date of snow thawing and the initial (r=0.719) and 50 per cent dates of the moth appearance in the first brood (r=0.796).<br>5. The correlation between the time of emergence of the first brood moths and the growing state of principal varieties of apples was recognized at very high level as have seen between the initial date of moths and the first bloom of American Summer Pearmain and Jonathan, the full bloom of American Summer Pearmain and the petal fall of American Summer Pearmain and Jonathan, between 5 per cent of moths and full bloom of Jonathan and the petal fall of American Summer Pearmain and Jonathan, beside these, between 50 per cent of moths and the breaking stage and petal fall of Jonathan.<br>6. Testing the compendious formulae to forecast early using the initial and 50 per cent dates of moth appearance, the errors were so small as respectively 2.35 and 1.8 on the average.

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