The Effection Of Toadstool Pesticide On Blattella Germanica

The German cockroach9(Blattella germanica)is one of the most stubbon urban pests worldwide to pesticide and hard to prevent Using natural materials is the most promising scientific field to be developed in biological control. The article carries out multigroup test and research in feeding.German cockroaches and the selecion of the poisonous baits,the seletion of the toadstool type and the different toxic effect of products on the German cockroaches,the test on bait stability,the sceening of the best ratio of the mixed toxic fungal.The results are following:(1) With the screening of 8 kinds of food from powdered milk,corn flour,soybean flour,crumbs of bread,rodent feed,flour,biscuit,millet flour tested by 3 groups of duplicate tests, rodent feed is chosen as the vector of poison bait for its large and steady amount eaten by German cockroach and its additional diverse components and cheap cost. By screening 4 kinds of assisting material,we have a conclusion that another 5% brow sugar is best for the vector of poison bait composed of rodent feed with 5% brow sugar.In the course of feeding German cockroach, we find that it has a strong resistance to the parasite of high-density and particularly liable to the water.(2)In the test of killing German cockroaches by toxic toadstools,19 kinds of collected toadstools are firstly isolated and purifilized cultivated,secondly,4 kind products of toadstools which includ fresh fruiting body,powder fruiting body,the products of liquid and solid culture,are used to experiment of insecticidal activity by the method of,which has 3 groups of duplicate tests.Ultimately decided that the insecticidal activity of toadstools are more better,including that Amanita kwangsinsis,Amanita pantherina,Amanita virosa,Scleroderma citrinum, Amanita phalloides. And the results of insecticidal activity was the best which are the liquid fermentation of 5 kind toadstools.The above,5 kinds of toadstools were experienced of insecticidal activity to German cockroach,respectively,so we have a conclusion that the LC₅₀ of Amanita kwangsinsis is 9.22480mg/g,Amanita virosa's LC₅₀ is 12.30383mg/g,Amanita pantherina's LC₅₀ is 16.40091mg/g,Scleroderma citrinum's LC₅₀ is 20.80282mg/g,Amanita phalloides's LC₅₀is23.22490mg/g. (3)In the course of testing stability of the poison baits,it is handled by high temperature and strong light.Then it has the test of insecticidal activity,so we have the concludsion that stability of the high temperture is more stronger, while the light is weaker.(4) Amanita kwangsinsis,Amanita virosa and Amanita pantherina,the three selected toadstools which have the best toxicity from a single dose,can get the best ratio by using the method of interactive.By mixing the three most powerful compound mode with co-toxicity parameter,Amanita kwangsinsis and Amanita pantherina is143.98,Amanita kwangsinsis and Amanita virosa is130.09,Amanita virosa and Amanita pantherina is124.55,the coefficient is more than100,showing the synergies.The LC₅₀ that Amanita kwangsinsis and Amanita pantherina is7.89112mg/g,Amanita kwangsinsis is 7.95337mg/g,Amanita pantherina is 11.18759mg/g.