Sugar orange arrow tip insect infestation is one of the common insect pests in sugar orange cultivation, arrow tip worm also known as arrow tip shell worm, arrow worm. It occurs in sugar orange producing areas. The following Xiaobian takes you to take a look at the harmful symptoms and prevention methods of sugar orange arrow tipworm infestation!
【Hazard Symptoms】
The yasknis mainly harm the leaves, young branches and fruits of sugar oranges, and use adult and nymph swarms to gather on the back of the leaves and on the surface of the fruit to suck up sap. The damaged areas of the leaves are yellow spots, and when severe, the leaves are twisted and deformed, causing curly leaves and dead branches, and the tree is weakened, causing leaf fall, affecting yield and fruit quality, and inducing soot disease.
【Life Characteristics】
It occurs in 3 generations in Gannan, Jiangxi Province, with female adults and 2nd instar nymphs overwintering in the leaf back and young shoots. Egg laying begins in late April of the following year, with the first generation of nymphs appearing from late April to early May, the second generation of nymphs appearing in early and mid-July, and the third generation of nymphs appearing in mid- and late September, and stopping laying eggs when the average daily temperature drops to 17°C in October. The spawning period of adults is up to 40 - 50 days, and the egg stage is extremely short, about lh or so. The first generation is mostly on the old branches, the second generation is mostly on the new leaves and some fruits, and the third generation is mostly on the fruit. The yask-tipped silkworm does not allow parthenogenesis. It prefers seclusion, warmth and humidity. Orchards with closed tree canopy and poor ventilation and light transmission suffer heavily. Females feed on dispersion, and males tend to congregate near the mother.
【Prevention and control method】
(1) Strengthen the insect situation monitorIng After the emergence of the first generation of young insects, the development of male young insects on the autumn leaves of last year or the spring leaves of the year should be often checked, and if a small number of male insects appear on the back of the "bird-like" 3 white wax filaments, the first drug should be sprayed within 1-5 days. Before the occurrence of the first generation of young nymphs from late March to early May, observe the presence of hatchlings directly in orchards, spray the first drug within 21-25 days after the first sight, spray the second drug every 15-20 days, and also spray once in early to mid-to-late May. When there are 10% of the leaves of the overwintering female adults in the autumn shoots last year, or there are 1 small branch group on the tree with obvious insects, or a few branches and leaves are scorched, or when the number of female adult overwintering female adults on the leaves of the autumn shoots last year reaches 15 heads/100 pieces, the agent should be sprayed.
(2) Pharmaceutical control Agents can choose 20% rapid bug killing 1000 times liquid, 35% fast g 1000 times liquid, 40% bug killer 800 ~ 1000 times liquid, 25% bug death net 800 times liquid, 25% bug killing 1000 times liquid.
(3) Agricultural control measures Thoroughly clear the garden in winter, and cut off the seriously damaged insect branches, dry dead branches and closed branches to reduce the source of insects and improve ventilation and light transmission conditions. Spray pine alkali mixture 8-10 times liquid or 95010 oil emulsion 60-100 times liquid in winter and before germination of spring shoots, etc., to eliminate overwintering insect eggs.
(4) The use of natural enemies to control The Japanese square head beetle, the whole chest and the oligopod ladybird, the Hubei red-spotted lip ladybird, the arrow-tip aphid wasp and the flower horn aphid wasp, etc., are all natural enemies of the arrow-tip aphid. Attention should be paid to the protection and utilization of natural enemies during the occurrence of 2-3 generations of sandworms.
The content of this article is a detailed introduction to the prevention and control methods of sugar orange arrow tipworm pest hazard symptoms, and sugar orange growers in need can take a good look!
Source: Huinong Network