Kyushu Plant Protection Research

1.) Laboratory tests were conducted using both spraying and dipping methods to reveal the effects of some insecticides on the Hymenopterous parasites within the mummified Macrosiphum avaenae FABRICIUS.
2). The insecticides, which gave more than 80% mortality on the parasites, were Fussol (monofluoroacetamide 10%, dilution 1 : 100), Parathion (methyl-parathion 40%, dilution 1 : 2000), Sumithion (MEP 50%, dilution 1 : 1000) and Hokuthion (γ-BHC 15%, dilution 1 : 300). Dime-thoate 46% (dilution 1 : 1000) and malathion 50% (dilution 1 : 2000) were not detrimental to them.
3). Treatment with either Fussol and parathion killed about 50% of the parasites in larval and pupal stages. But with Sumithion and Hokuthion, it was only 30% and 10% respectively, and the same of the adult stage depended upon the residual effect of the insecticides in question on the adult parasites within the mummified aphids.
4). Judging from the stages of parasites killed by the insecticides, it may be assumed that Fussol and Parathion acted more destructive than the other insecticides.

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A survey on the Prodenia litura was conducted at Chikugo City of Fukuoka Prefecture in 1963. As a result, a parallel relation was recognized between the number of moths captured in a light-trap and the number of egg masses detected on the taro plant. During August and September eggs were continuously oviposited on the plant. The egg masses had high rate of survival under field condition.
It was considered that records obtained from light-traps were useful in estimating not only the adult population but also the size of young larvae infestation. The seasonal prevalence of flight of the moths to light-trap and oviposition on the plant were as shown in figure 1 in which the recording of flight started from August. Figure 2 shows the correlation between the moths captured in the light-trap and the egg masses detected on the plant during August and September. Solid line with solid symbols in figure 1 and abscissa in figure 2 express the number of insect moths captured in the light-trap, and dotted line with open symbols in figure 1 and ordinate in figure 2 express the number of the insect egg masses detected on the plants in 43 hills.

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Records of observations on the behaviour of fruit-piercing moths in tomato field were taken during August and September of 1963 in Shimabara, Nagasaki Prefecture.
14 species of moths were found to feed on tomato juice by piercing fruit skin. The most injurious species were Oreasia excavata BUTLER and O. emarginata FABRICIOUS.
Females composed chiefly the sucking individuals. In some fields more than 40 per cent of the fruits were found damaged by the sucking moths. It was estimated that one sucking moth can damage on the average 2 tomato fruits for night of feeding. The number of piercings for fruit ranged from 1 to 8.
The damage from the moth was reduced effectively by covering the tomato fruits with vinyl nets of 7 mm mesh.

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In the first report, the authors described the biology of fruit-piercing moths attacking the tomato fruits in Shimabara city.
This paper gives the results of experiments on the controlling effect of light against the damage caused from their attack.
Using about 6 a. of experimental tomato field, 20 watt blacklight fluorescence lamp, 20 watt blue flurescence lamp and 100 watt electric globe were tested.
The field was lighted by 3 each of fluorescence lamps and an electric lobe. Number of damaged fruits and moths in the field were reduced at the lit field rates of 5 percent. Damaged fruits in the lighted plot against 25 percent in the un-lighted plot.

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