It is very important to control Spodoptera litura in mountain orchards.

Fruit-sucking armyworm is one of the common pests in orchard, once the disease occurs, it will do great harm to the fruit. Therefore, it is very important to control Spodoptera litura in mountain orchards. Next, let's take a look at the main points of prevention and control.

What is a fruit-sucking armyworm?

Spodoptera litura is a fruit tree pest, which sucks the fruit juice with adults, resulting in fruit decay and fruit drop. In addition to harming citrus, it also harms apples, pears, grapes and other fruits. It is distributed in many countries and regions in Asia, Africa, America and Australia. There are more than 100 species in the world, and more than 50 species are known in China.

The occurrence of Spodoptera litura, Spodoptera litura and Spodoptera litura are common and serious in citrus producing areas in China.

Spodoptera litura. The adult is 16-19 mm long and has a wingspan of 34-40 mm. The body is brown and the head is reddish brown. Forewings brown, middle part of outer margin protruding angled; middle part of inner margin sunken. The larvae are about 38 mm long, dark in color and often bent into a bridge shape. In the vast areas of southeast and central China, the occurrence often accounts for more than 70%.

Spodoptera litura. The adult is 23mm long and has a wingspan of 49mm. The body is brown and the head is red and orange. The front wing is purple-brown, the wing tip is hooked, the outer edge is rounded in the middle, and the middle of the inner edge is more concave. The larvae are gray and black with black stripes. The head is taupe. Walk in the shape of an arch bridge.

Spodoptera litura. The adult body is about 40 mm long and the wingspan is about 105 mm. The head and chest are ochre brown and the abdomen is apricot yellow. The forewings are as dark brown as dead leaves, with a dark brown diagonal line from the tip of the wing to the depression of the trailing edge. The hind wings are apricot yellow with arc-shaped and kidney-shaped black spots. The body color of the larvae is yellowish brown or grayish brown with dark lines, reddish brown head and often arched in front of the body. It occurs more frequently in Sichuan and also in Japan.

2. Control methods of fruit-sucking armyworm in mountain orchards.

1. Agricultural prevention and control

Rational planning of orchards, as far as possible to develop into a large area of planting, and try to avoid mixed planting of different mature varieties or a variety of fruit trees.

From May to June, the weeds and shrubs in and around the garden were completely eradicated by herbicide spray or artificial herbicidal prescription, so as to reduce the larval population density and reduce the hiding places of adults.

2. Physical control

Entrapment. Trap and kill adults with black light, high pressure mercury lamp or frequency vibrating insecticidal lamp.

Fruit bagging protection.

Refuse to avoid. Each tree uses 5-10 pieces of absorbent paper, each dripping citronella oil 1ml, hanging around the crown in the evening, or wrapping naphthalene pills (sanitary balls) with plastic film, pricking several holes, each tree hanging 4-5 tablets, which can reduce the harm of fruit-sucking armyworm.

3. Artificial prevention and control

Organize manpower to hunt and kill adults in the orchard after dusk during the fruit coloring period.

4. Biological control

Trichogramma was released artificially around the orchard and parasitized to absorb the eggs of fruit armyworm.

5. Chemical control

Lure and kill adults with sugar and vinegar solution (properly adding a small amount of insecticide with light taste) before the fruit is half-ripe.

To trap and kill adults with banana or orange fruit extract (20 times of trichlorfon solution)

Spray 4.5% cypermethrin EC or 2.5% cyhalothrin (kung fu) EC 1 000 × 1 500 times in the dark, or mix 80% dichlorvos EC with water 1 000 times to spray when the moth is active at night.