1964 Volume 10 Pages 27-28
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.
