Study on the Chemical Control of Monochamus alternatus

During the adult′s replenishing nutrient period, chemical control is the effective way of cotrolling the population of Monochamus alternatus by spraying pesticides.After three different spraying treatment of mixing fenthion, polyvinyl alcohol (PA) and deltamethrin,and at the same time,feeding treated twigs in laboratory as auxilizary means.As result,chosed the best type of pesticides:fenthion(12%):PA(9711)(40%):deltamethrin (12%) diluting 150:10:2000,can remain at least 20 days′ extended controlling, and reduce ratio of death of Pinus massoniana at 100%,twigs′ 96.4%. Methamidophos (50%) 1:3 as the efficient type for ejecting pesticides into trunk at 0.5 m height from ground,but dense adult population can cause much more flunctuation. PA(9711) can sustain longer extended controlling period than BA 154 as adeherent substances,respectively,with 50% fenthion on Pinus massoniana and feeding the adults with these treated branches in laboratory,and PA(9711) attributes to extend fenthion 28 days′ ability,so it can use as the optimum auxiliary solvent,but BA 154 became resistant to fenthion.