Studies On The Occurrence Law And Control Methods Of Spodoptera Litura Fabricius In Guangdongfoshan

Spodotera litura, that is lepidopteral cutworm. The pest broke out all over the world. Spodotera litura got on well here and there in our country with many characters. Such as polyphagia glutton eugonic. The pest did harm to 99 subject 290 genus plant. Above all, more than 90 species plants were the most favorite feeding to them. Recent years, the damage and loss caused by Spodotera litura in regetable and flower had become more and more serious. It was difficult to control the disaster compositive ways and meas to prevent spodoptera litura were studied. Especially in a military area of Guangzhou which had a large scake flower production.Degree of calamity living habits of spodoptera litura and many natural enemy were investigated in vegetable and flower plantation. The results showed that the law of growth and development. The first pinnacle broke out from the first ten days of May to the first ten days of July. From July to September, the amount of Spodotera litura reached the crest. The period was the key to prevent the pest. There were many natural enemy in south China. Such as, ant, frog, hoptoad, padosa astrigera oxyopes sertatus, ocypoes lineatipes eocanthcona furcellata, microplitis pallidies. The relation of feeding amount and growth and development of tobacco cutworm larrace showed that controlled feeding could decrease the weight of pest and chrysalis, and restrained the upgrowth of them. The influence of temperature to the growth and development survival rate and fecudity of laboratory population were studied. The effect of temperature on the ecdysis is significant. More than half percent of grub had ecuviated 6 to 7 times to reach 7to 8 in stars in low temperature of 15. but most of the grab ecuviated 5 times to reach 6instars in high temperature of 29 to 34. under this condiction only leastof grub would ecuviated 6 times to reach 7 instars. There was na 8 instars in high temperature of 29. the hatch ration grab and pupa survival rate quantity of imagos daily apawn were the tiptop. The ratio of famale was the least. The higher or lower was the temperature. The lower hatch ratic was the lower survival rate of grab and pupa was the foeer quantity of spawn was, the higher rate of the famale was. In contuast with main fold chemic and biologic pestude. The most eddective medecamentous measunes were beauveria bassiana, avermectins, NPV, 48% lorsban, l%wekda, 5%emamectin bezoate, and so on.