Application of cynanchum glaucescens extract in controlling psylla chinensis

Abstract

The invention relates to an application of a cynanchum glaucescens extract in controlling psylla chinensis, belonging to the field of biological control of plant sources. Control effects of cynanchum glaucescens extract water aqua on overwintering psylla chinensis adults are preliminarily studied by using indoor toxicity measurement and field trial methods. Researches show that the cynanchum glaucescens extract water aqua in different concentrations has remarkable lethal effect on the overwintering psylla chinensis adults; after the overwintering psylla chinensis adults are treated for 24 hours, the field control effect of 0.07mg / mL of cynanchum glaucescens extract water aqua on psylla chinensis adults reaches 66.8%, and the indoor biological measurement effect reaches 100%; and the concentration of a formula is positively associated with the lethal effect on the overwintering psylla chinensis adults. Research results provide a green control medicament and technology for control of the overwintering psylla chinensis adults in pear orchard.

Description

technical field [0001] The invention relates to a method for biological control of psyllid, in particular to the application of the extract of Rhododendron in preventing and controlling psyllid. Background technique [0002] The Chinese pear psyllid Psylla chinensis Yang et Li belongs to the family Psyllidae of the order Homoptera, also known as the pear psyllid. It is widely distributed in most parts of China and is one of the most important pests in pear orchards. In recent years, it has spread in North China, Northeast China and even The serious occurrence of pear orchards in the south of the Yangtze River has become one of the key factors affecting the production of pear fruit. The existing comprehensive prevention and control methods generally adopt: [0003] (1) Agricultural control, that is, completely clearing the dead branches and weeds of the tree, scraping the old bark, and pouring frozen water in severe winter can reduce some overwintering adults and play a cert...

AI Technical Summary

Problems solved by technology

[0003] (1) Agricultural control, that is, to completely remove the dead branches and fallen leaves of the tree, scrape the old bark, and pour freezing water in severe winter can reduce some overwintering adults and play a certain role in prevention and control, but the effect is limited

[0004] (2) Chemical control during the peak emergence period, that is, spraying 1500-2000 times of pyrethroid chemical agents during the peak emergence period of overwintering adults in mid-March to control the base number of hibernating adults and reduce the number of overwintering insects. While killing pests, it also kills natural enemies and destroys the ecological balance of orchards; on the other hand, in organic pear orchards, the use of pyrethroid chemical pesticides is prohibited, and botanical pesticides are allowed to be used

Using 10% imidacloprid 4000-6000 times solution, 1.8% Ainuochongqing (Zenmectin) 2000-4000 times solution, 3.2% Abamectin (No. 4) 5000-8000 times and other agents and concentrations, severe pear orchards occurred, Add Zhusha or Xiaojieling 1000 times solution, organic silicon and other additives to the above-mentioned chemicals and concentrations to improve the efficacy, which can significantly reduce the population of pear psyllids in the orchard and reduce damage. However, this period is also the peak of natural enemy insects in the pear orchard. In the early stage, the application of chemical pesticides killed a large number of natural enemies in the orchard, which could cause the re-emergence of pests in the pear orchard; The agent is a kind of efficient environment-friendly agent

Images