Biological characteristics of Propachys nigrivena

Key words: 
• Propachys nigrivena /
• biological characteristics /
• harmful insect /
• chemical cantrol

Abstract: Propachys nigrivena is a new pest that damage the camphor tree (Cmnamomum camphora)in Fujian Province .It is three generations each year and overwinters as aged larva cocooning and pupating in the soil .The adult of the pest moults in early or middle April next year .The first generation of the larva hatches in late April to early May .The aged larva pupates into soil one after another in middle or late June .The adult of the first generation moults and ovulates in late June to early July .The second generation of the larva hatches in early July and pupates into the soil in middle August .The adult of pest moults in late August .The third generation of the larva hatches in middle September .The pest overwinters as aged larva pupating into the soil in late October . Control could be made at the larval prevailing stage by spraying tree crowns with 3 000-fold solution of 20 % decamefhrin or 1 000-fold 80 % dichlorovos or 1 000-fold 50 % methamidophos , resulting in 90 % of the larve being killed .