On the Feeding Quantity of the Pryeria sinica Moore

Abstract

We have known that the Pellucid zygaenid (Pryeria cinica Moore) are the important defoliator to the Euonymus japonicus Thumb. in Japan.
In this report, the author deals with the resultof the breeding of Pellucid zygaenid (Pryeria cinicaMoore) in laboratory. These investigation wereconducted from 1971 to 1973.
In order to known the correlation between the feeding quantity and frass, the author measured the feeding broad leaf area, its dry weight, the larval weight and the dry weight of the frass.
The result obtained from the investigations were as follow:
The appearance of the adult of this species is one time in a year and it falls on the season from the beginning to the middle of November.
The overwintering of this species take place in the stage of egg and the hatching is observed at the middle part of March, and then the larva is observed during March and the early part of May. Although the coccooning of the larva of this species take place at the season from the beginning to the middle of May, they pass through a long time from. summer to autumn in the pupal stage.
The life history chart of this species are shown in Table 1.
The correlation between the feeding quantity and the amount of the frass were shown with the straight line on the logarithms, that is;
log Lw = 0.9807 log F+0.1636
log La=1.0279 log W+0.3894
Lw: dry weight of leaf in mg
F: dry weight of frass in mg
La: feeding leaf area in mm²
W: larval weight in mg
The total feeding leaf area at the larval stage was 57.8cm².
The total feeding at the last instar was the greatest, namely, in comparison with the total, its amounted to about 80%.