Studies on the parasite complex of garden pea leaf-miner, Phytomyza horticola (Dip.: Agromyzidae) in Nanchang area.
A total of 17 hymenopterous parasitoids were reared from the larvae and pupae of agromyzid leaf-miners collected from 13 plant species in Jiangxi, China. All of them parasitized Phytomyza horticola [Chromatomyia horticola]. The rate of parasitism in the field was 13.24, 4.36 and 25.65% for the 1st, 2nd and 3rd generations of the pest, resp. Four parasitoid species, the braconid Opius sp. and the eulophids Diglyphus isaea, Chrysocharis pentheus and C. phryne, were found to be dominant among the parasitoid complex, accounting for 91.9% of the total parasitoids collected. Except for D. isaea, the dominant parasitoids spent part of their life cycles on alternative hosts. After June they transferred to leaf-miners on such plants as Caryopteris incana, Dolichos lablab [Lablab purpureus] and Raphanus sativus [radish], and returned to the fields of garden pea and rape in late autumn. The parasitoids showed no obvious winter diapause.