Occurrence regularity and control points of copper green golden tortoise shell

Coleoptera, Coleoptera. It occurs in many apple orchards in our area. the hosts are apple, Hawthorn, begonia, pear, apricot, peach, plum, persimmon, walnut, grass poison and so on.

I. harmful symptoms

The tortoise shell of the genus Malus suffered the most, and the adults ate the leaves, which often caused the leaves of a large area of young fruit trees to be incomplete, even the whole leaves were eaten up.

Second, occurrence regularity

(1) the golden tortoise shell produces one generation a year and overwinters as mature larvae in the soil.

(2) damage to the roots of crops and weeds before the larvae pupate in the spring of the following year. The adults in Zhaoyang District emerged into adults in mid and late May, and the adults began to be unearthed at the beginning of June. The time of serious damage was concentrated from June to early July, and the number of insects decreased gradually after the middle of July, mainly for about 40 days.

(3) Adults rise during the day and at night, begin to be unearthed after sunset, mate first, then feed, then sneak back to the soil at dawn, mostly hide in the upper layer of the 3-6cm deep surface, and like to inhabit loose and moist soil.

(4) the adults have pseudo-death habits and strong phototaxis, the number of light traps is large, and the number of females is more than that of males. About 10 days after being unearthed, the eggs began to lay eggs in the soil, and the spawning depth was mostly at 3-10cm. The larvae mainly ate the roots of the plants, and overwintered directly in the soil when they matured.

III. Prevention and control methods

(1) Pesticide control

1. Spray 1500 times of fenitrothion (fenitrothion) EC or 1500 times of 50% parathion EC in the canopy of adult occurrence.

2. Spraying lime excess Bordeaux liquid has a certain repellent effect on adults, and it can also be applied in topsoil layer.

3. 1000 times of phoxim emulsion is applied in the tree plate or garden edge weeds, and then shallow hoe into the soil can kill a large number of adults lurking in the soil.

(2) artificially control and make use of the false death habits of adults, and kill adults sooner or later.

(3) trapping and killing adults make use of the phototaxis of adults. When a large number of adults occur, they are set on fire at the edge of the orchard after dusk. Conditional orchards can use black light to trap a large number of adults.