Prevention and control of diseases and insect pests of mango

First, the most harmful ones are Spodoptera litura, Spodoptera litura and so on. Adults pierce the fruit with sharp mouthparts to absorb the juice of the pulp, causing the fruit to fall off. The fruit was prickled before harvest and rotted during storage and transportation.

Second, the morphological characteristics of Spodoptera litura, Spodoptera litura and Spodoptera litura are different.

1, mouth pot night: also known as peach yellow brown night moth. The adult head and forechest are reddish brown, and the middle, posterior chest and abdomen are brown. The antennae of females are linear and the antennae of males are pectinate. The tip of the front wing protrudes. The middle part of the outer edge protrudes into an angle, the middle part of the trailing edge is concave arc-shaped, the basic color of the front wing is reddish brown or purple, the middle horizontal line and the twill from the tip of the wing to the middle of the trailing edge are darker; the rear wing is yellow-brown, and the inner side of the outer edge is grayish brown.

2. Spodoptera litura: the adult body is brown, the head and forechest are red-orange, and the middle and posterior breasts are ochre. The front wing is purple-brown, linear, the tip of the wing is hooked, the middle of the outer edge is rounded, the middle of the trailing edge is circular and concave, there are two parallel dark brown lines oblique to the middle from the wing tip, the reniform line is obvious; the rear wing is light brown, brown along the outer edge and vertex, and the brim is light brown.

3. Withered leaf armyworm: also known as tomato armyworm. Adult antennae filamentous. Head, chest brown, abdominal back apricot yellow. The forewings are withered brown with a dark brown twill from the tip of the wing to the concave part of the trailing edge. The hind wings are apricot yellow with an arc-shaped and kidney-shaped black spot.

Third, the life habits of the three pests are also different.

1. Spodoptera litura: 4-6 generations a year, generations overlap, overwintering with mature larvae and pupae. Adults can be found from May to November. Activities such as smoking, mating and spawning are all carried out at night, and the activity is at its peak before 10:00 at night. Eggs are scattered on tender leaves and stems. The mature larvae spin the leaves and soil grains into a tube and lie dormant and pupate at the base of the trunk, in the weeds or in the topsoil layer.

2. Spodoptera litura: 4-5 generations a year, overwintering as adults, larvae or pupae. Adults suck the juices of many kinds of fruits at night. It has phototaxis. After Eclosion, adults need to suck sugar as nutrition before they can mate and lay eggs. The larvae feed on tender leaves, and the mature larvae often pupate with silk, leaves and broken branches in the weeds near the base of the host plant.

3. Spodoptera litura: there are 2-3 generations a year, and most of them overwintered with larvae. After dusk, fly into the orchard to harm the fruit, increase when it is dark, and hide after dawn. After emergence, the adults mate at night, and the eggs are laid on the back of the leaves of the host plant. The larvae feed on the host leaves, and the mature larvae are buried and pupated. The damage of adults can be seen from August to November.

Fourth, the first control method is to remove the host plants of the larvae, remove weeds and reduce the source of insects within 500m of the orchard. Second, select the paper with good water absorption, cut it into the size of 5cm × 6cm, drop appropriate amount of citronella oil, hang it evenly on the crown in the evening, and avoid adults. 5-10 pieces of each tree of 5-7-year-old trees are hung in the morning, and then hung again on the second night after dripping citronella oil. Third, before the fruit is ripe, collect the near-ripe ground fruit, leave the peel at both ends, remove the rest, pierce the pulp with a needle, soak it in 90% trichlorfon 20 times solution for about 10 minutes, take out and thread it and hang it on the tree, which has a certain trapping effect on fruit-sucking armyworm that eats injured fruit and healthy fruit. Fourth, use a flashlight at night to catch and kill adults. Fifth, in the middle of fruit growth, paper cover fruit, the control effect is very good.