害虫の疾病に関する研究(第3報) : ニカメイガ幼虫における黄きよう病菌の潜伏期間及び菌糸の発育と温度の関係

Studies on the disease of insects(No.3) : The relation of the environmental temperature to the incubation period and the hyphal growth of Isaria farinosa(DICKS．)FR., inoculated into the rice stem borer, Chilosuppressalis WALKER

Miura, Tadashi

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1) The incubation period varied with the environmental temperature, shorter in a higher-temperatured section and longer in a lower-temperatured.
The periods at several degrees of temperature are shown below.
<tt>
┌───────────────────────────
│ Temperature │ Experiment A │ Experiment B │
├───────────────────────────
│ ℃ │ Mean (hrs.) │ Mean (hrs.) │
├───────────────────────────
│ 28 │ 136.80 │ │
│ 24 │ 155.40 │ 147.50 │
│ 20 │ 187.80 │ 153.20 │
│ 16 │ 273.00 │ 187.50 │
│ 12 │ 475.20 │ 292.80 │
└───────────────────────────
</tt>
In the case of Experiment A, the larvae were put at their respective degree immediately after inoculated with the conidia.
In the case of Experiment B. they were kept at 28℃ for 48 hours after the inoculation, and then put at their respective degree.
The time from the inoculation to the appearance of aerial hyphae is as follows :
<tt>
┌───────────────────────────
│ Temperature │ Experiment A │ Experiment B │
├───────────────────────────
│ ℃ │ Mean (hrs.) │ Mean (hrs.) │
├───────────────────────────
│ 28 │ 149.28 │ │
│ 24 │ 184.20 │ 173.50 │
│ 20 │ 216.60 │ 181.09 │
│ 16 │ 314.40 │ 227.00 │
│ 12 │ 592.20 │ 370.08 │
└───────────────────────────
</tt>

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d0020007n016.pdf 609 KB