No abstract

No abstract

In order to examine the relative abundance of indigenous parasitoids against three leafminer species, Liriomyza trifolii, L. sativae and Chromatomyia horticola, kidney bean plants infested with larvae of each species were exposed in vegetable gardens or grassland to different seasonal conditions (spring, summer and fall). Abundant parasitoid species were Chrysocharis pentheus, Diglyphus isaea and D. minoeus in spring or fall, and Neochrysocharis formosa, D. albiscapus and D. pusztensis in summer. Also, abundant parasitoid species varied among the different field conditions; however, within the same season and field the dominant parasitoid species were similar in all three leafminer species tested. Our findings indicate that the dominant parasitoid species did not exhibit any strong preference in the field between the three host species, namely L. trifolii, L. sativae or C. horticola.

The insecticidal activity of the entomopathogenic fungus Beauveria amorpha (strain HpBa-1) to larvae of the yellowish elongate chafer, Heptophylla picea was estimated under various temperature conditions. High mortalities were obtained and the mortalities of H. picea rose rapidly at 25°C and 20°C. Insecticidal activity of HpBa-1 was observed at 15°C and 10°C and infection of the fungus resulted under these temperatures. HpBa-1 showed little infectivity at low temperatures under the field conditions. Hence, HpBa-1 recovered infectivity when the temperature increased. These results suggest HpBa-1 is useful as a microbial control agent against larvae of H. picea.

No abstract