Ectropis occurrence trend prediction and prevention advice

First, the forecast based on

1, the insect population rises rapidly , the occurrence of large, heavy damage . March 20 -28 survey fifteen tea , tea inchworm up to 3 per square meter , a minimum of 0 , average 0.24 ; pressure sprayers April 7-9, 2009 survey Ectropis up to 26 , a minimum of one average 4.6 . Insect population density, rising fast, heavy damage .

In late February and March to early April rain , field humidity, frequently alternating cold and warm . Also, according to weather forecasts four months late, there are 2-3 times rainfall, the temperature rose rapidly , is conducive Ectropis occurrence and hazards.

Second, prevention and treatment advice

1 , control indicators: per square meter Ectropis larvae 4-5 head , instantly drug prevention and treatment .

2, control Time: April 18 -4 at the end of 400 meters above sea level areas were late for 3-5 days. Serious tea interval of 5-6 days in a row with a good two drugs.

3, the control strategies :

( 1 ) Biological control : To ensure safety of the county green , resolutely implement green plant protection , public plant concept, in acres of tea plantations on medication should be used avermectin 80 ml of 2% or 0.5% bitter raw base 100 ml , to achieve both eradication of pests , and protection from predators a virtuous circle.

( 2 ) Chemical control : mu selection of efficient and low toxicity of 2.5% trifluoroacetic cyanuric chloride ( kung fu ) 120 ml or 100 ml of 2.5% bifenthrin .

Choose one of these agents , watered 45 kilograms per mu motorized plastic sprayer , hand sprayer watered 60 kilograms per mu , at 16:00 after a uniform spray. And after treatment interval 7-10 genius for picking.