Test And Popularisition On Controlon Pest In Vegetable And Medlar With Biopesticide BtA

As Ningxia hui nationality autonomous region's specialty and preponderant industry, the speed of vegetable and medlar development is quite rapid. But the agrochemical's residue exceeded the criterion and as a bottleneck, it has blocked the vegetable and Medlar - - the two main industry's development. So it is extremely vital to made a deep study and demonstration of biorational pesticide integrated pest management as represented by BtA. Furthermore, it is also vital to control plant diseases and insect pests of vegetable and medlar, improves the quality of farm produce and promotes the agriculture of sustainable development. After 3 years research and primary demonstration, we have achieved obvious economic and ecological benefit. The main results are as follows:(1) Bioassay of Tianba (BtA) against Plutella xylostella showed : biorational pesticide Tianba (BtA)'s activity is higer than Fenvalerate and Phoxim. The corrected mortality of 600 times of Tianba (BtA) against Plutella xylostella after 5 day reached 98.83%.(2) The results of field trials of Tianba (BtA) against Plutella xylostella showed: the 600 times ,800 times, 1200 times of Tianba (BtA) had obvious control efficacy .Their activity after 5 day is higer than regular pesticide Fenvalerate and Phoxim. The corrected mortality of 800 times of Tianba (BtA) against Plutella xylostella after 5 day reached 91.35%. Although its quick result is not so good, their extended control efficacy is good , 800 times of Tianba (BtA)'s control effect was more than 88.55% after 12 day of spraying .So we can arrive at a conclusion: the economical concentration of Tianba (BtA) is about 800 times..(3) The results of field trials of Tianba (BtA) against aphids showed: the 800 times of Tianba (BtA) had an obvious control efficacy, its control effect was 77% after 12 day of spraying .the longest control time was above 25 days.(4) The results of field trials of Tianba (BtA) against medlar aphids showed: the 800 times of Tianba (BtA) had an obvious control efficacy, and its extended control efficacy is good, was more than 80% after 12 day of spraying .(5) The result of biorational pesticide Tianba (BtA)'s residue on vegetable and medlar showed :At concentration 800 times,the residue dosage was quite small after 1 day and 2 days of spraying, after 3 days of spraying , Tianba (BtA) can't be detected.(6) The investigation result of biorational pesticide Tianba (BtA) effect on natural enemy tribe showed: Tianba (BtA) and Imidacloprid can reduce the quantity of natural enemy tribe,but Tianba (BtA)'s protection to preponderant natural enemy is better than Imidacloprid. Attention : The preponderant pest in cabbage field is aphids and Plutella xylostella, the natural enemy is Apanteles bicolor Nees..With the temperature raise, aphids ,Plntella xylostella and Apanteles bicolor Nees.'s preponderant grade become large.(7) On the basis of field trial, according to the main pest's occurring rule of vegetable and medlar on Ningxia , associated with production and practice , we summarized an economical , popularized and biorational control technology as represented by Tianba (BtA), developed an optimized biorational measure and established control scheme. Biorational pesticide Tianba (BtA) demonstrated base brought beneficial economic benefit,social benefit and ecological benefit,and it also accelerated the further development of biorational agriculture of Ningxia.