Red spider development process HD illustration one, understanding the red spider two, red spider occurrence period three, red spider resistance four, red spider development process

<h1 class="pgc-h-arrow-right" >, know the red spider </h1>

Citrus red spider, scientific name citrus full claw mite, is the most harmful pest on citrus, the temperature is about 25 degrees when the breeding is the most abundant, generation overlap is serious, May to June mites the most abundant, July to August due to high temperature leaf mite occurrence is very small, September to October there is a second peak of pest, harmful to autumn shoots and fruits, occurs 13-20 generations / year throughout the year, to adult mites and eggs in the leaf dorsal main vein on both sides and in the gaps in the branches.

<h1 class = "pgc-h-arrow-right" > second, the red spider occurrence period</h1>

<h1 class= "pgc-h-arrow-right" > third, red spider resistance</h1>

1. Short growth period (10-15 days from egg to adult, 25 °C);

2. Large egg laying (each adult worm lays 3-5 eggs per day, and can lay about 40 eggs on average in a lifetime);

3. It can be carried out for both sexes, and parthenogenesis can also be carried out, reproduction is fast, and parthenogenesis can inherit parental resistance;

4. Unreasonable use of pesticides.

The above problems lead to the serious resistance of citrus red spiders, which is also the main reason why orchards mention red spiders.

<h1 class = "pgc-h-arrow-right" > fourth, the development process of red spiders</h1>

Red spiders occur mainly through 5 stages: egg -larvae -anterior mite-posterior mite-adult mite (a growth period at 25 ° C, 10-15 days can be completed);

Red spider eggs

Eggs are mostly produced on leaves, fruits and young branches, with both positive and negative leaves, but mostly on both sides of the main vein of the leaf back. The starting temperature of the egg is between 8 °C and 9 °C, the accumulated temperature is 109.6 days, the optimal temperature of incubation is 26 °C, and the optimal humidity is 75%.

Red spider larvae

The young mites are nearly round and have 3 pairs of feet. The young mites of the overwintering generation are red, and the young mites of the non-wintering generation are yellow. The overwintering mites are red, and the non-wintering generations are yellow, with dark spots on both sides of the body.

Red spider pre-nymph

Red spider after nymph

Nymphs: there are 4 pairs of feet, and there is a distinct mass pigment on the side of the body

Mature red spider adults

Adult mites vary greatly in color, generally red, and have a long black patch on each side of the dorsal back. Female adult mites are dark red with dark spots on both sides of the body and are oval in shape.

Red spider molting process

Residue left behind after the red spider molts

A red spider in the process of molting

The nymphs in the activity

Adult red spiders in the activity

Article source: Agricultural bug big coffee