Dichocrocis punctiferalis Guenee is a peach pest, which is a peach pest. It also eats peaches, apricots, plums, plums, pears, persimmons, and chestnuts in addition to damaging the pomegranate. Fruits such as oranges also harm crops and oil crops such as sunflower, corn and sorghum.
Injury characteristics? Newly-incubated larvae in the pods or fruit surface foraging fruit peel tissue, second instar pods into the fruit after the food damage the young grains, pods outside the accumulation of a large number of insect feces. When larvae feed on food, they always hide their bodies under the silkworm-linked insect waste residue.
Morphological characteristics??
Adults: 12 mm in length and 25-28 mm in wingspan. The whole body is orange-yellow, with black spots of different sizes on the back and sides of the body. The female moth is conical at the end of the abdomen and black moths at the end of the male moth.
Egg: oval. The long diameter is 0.6-0.7 mm, and the short diameter is about 0.3 mm. The milk was white and beige when it was first produced, and later it became pink. The egg surface has a fine and irregular reticular pattern.
Larvae: 18 to 25 mm in length when cooked. Dark purple body back, belly light green. The head, the dorsum of the chest and the back of the hip are brown, and the body has distinct dark brown hairs.
蛹: Length 11 to 14 mm. Spindle shape. The pale yellowish-green color is present at the beginning of phlegm, and it turns dark brown later. The head, chest, and abdomen have 1-8 segments with tiny protrusions on the back, and the 5-7th belly segment has a protrusion line consisting of small spikes near the front edge. At the end of the abdomen there are 6 slender, curled hooks, which are sallow gray.
Living habits?? Tao Tao in our country every year across different generations of algebra, the North 2 to 3 generations, Shaanxi Guanzhong 3 to 4 generations, 4 generations of Nanjing, Jiangsu, Hubei, Jiangxi 5 generations. Mainly in the mature larvae in trunk damage, immobility, branching fork, cracks, tree holes, dead wood, under the skin and basket joints, debris, rock gap, corn cob, sorghum straw, sunflower disk, castor seeds Wait for the knots to pass through the winter. Overwintering hosts are complex and sites are scattered. The adult moths of Linfen in Shaanxi Province in late winter are in late April, and are in late May to early June.
Adults have a strong tendency toward black light, and they also have a tendency towards sweet and sour liquids. Adults take nectar and dew to replenish their nutrition. During the day, they lie quietly in the leaves and weeds at the dense foliage, and fly out of the night to copulate. In the first 2 to 3 days of spawning, from the middle of May, a new generation of eggs can be seen in the field, and the peak period is in early 5 and early June. From mid-May to late September, eggs are visible at all times in the field, and are highly overlapped between generations.
Eggs are sparsely scattered in the fruit pods, and there are also a large number of ovums that are produced on the side of a few fruit pods, on the fruit surface or fruit stems that cover the branches and leaves. One to two spawns each time. The eggs were milky to yellowish at the time of first production, and became bright red the next day. On the third day, the egg tops appeared dark brown, and a few larvae hatched. After the fourth day, most of the eggs hatched. The egg period is 3 to 4 days, and the maximum is 4 days. Generation larvae hatch in the middle and early June, mainly kill young fruit. There are often 1 or 2 larvae in each fruit, and some of them are spawned repeatedly. In a single fruit, there are multiple larvae of different ages. Generation larvae have a duration of up to 1 month and mature in mid- and late June. Most of the mature larvae after fruit removal climbed to the trunk fork, tilting subcutaneous, cracks, tree holes or weeds, fruit pods, etc. Department of gray brown phlegm. The first generation of adults began to appear in late June, the peak period in mid-July and late. The second-generation newly hatched larvae were found in the middle and early July, and the second-generation larvae took off from late July to early August, and the pomegranate fruit suffered the most. As the pomegranate is ripe at this stage, the grain is adequately nutritious and the larvae have a shorter duration of damage. In mid-July, old larvae have been discovered and matured during the first half of August. The second generation of adults first appeared in early August and the peak period was in the middle and late August. The third generation of newly hatched larvae began in the middle of August and the third generation of larvae occurred from late August to early September. This period coincides with the harvest time of pomegranate, which is very harmful to the marketed fruits and stored fruits. Since the temperature has dropped, the larval duration has become longer, and most larvae have not hidden larvae after searching for hidden places. In late August-September, there are still a few mature larvae that have become parasitized and paralyzed, and the third-generation adults have emerged. The third-generation adult spawning larvae continue to harm late-ripening varieties of fruit and other crops.
Prevention methods? Because the host of this insect is widespread and occurs over generations, the laws of transfer between local host and host should be investigated. Occurrence periods of adults in each generation should be accurately grasped. At the time of spawning and larval hatching, timely Spraying and combining other comprehensive measures can achieve better control effect.
1, remove the source of insects. After harvesting the fruit, before the sprouting, the tree is completely removed. The tree is dried, stiffened, bred, infested, concentrated, compacted, burned or buried; the corn stalk, cob, and sunflower disk are removed from the tree and the tree is removed. Assault and other measures to minimize the number of wintering pests. During the fruit growth period, anytime, remove, pick up the tree, crush, or bury the insects on the ground, and eliminate pests within the fruit in time. From mid-June, old sacks or straw ropes can be placed on trunks to trap larvae and slugs.
2, trapping and killing adults. From the end of April, a black light, a sweet and sour liquid bowl, and a sex attractant are installed in the garden to seduce each generation of adult insects. From June onwards, chickens can be stocked in orchards so that the larvae of the de-merging larvae and the underground larvae can be eaten by the chicken at any time.
3, chemical control. In the middle of June, when young fruits such as walnuts are large, use 2% killer pine powder, alpha powder or 90% trichlorfon, 50% phoxim 1000 times drug cotton balls, or 1:100 times 50% symplectic Sulphur-phosphorus-doped medicine ball blocked the syringe. In combination with plugging the caulk tube, it is also necessary to mix and spray 2000-fold 20% cypermethrin or 2500-fold 20% decancer 1 or 2 times during the flowering period, and the last time it must be laid in early June. Prosperous period. In the first and second half of July after the blockage of the snorkeling tube, 3000-5000 times 2.5% deltamethrin (enemy) or 2,000 times 50% phoxim was sprayed 1 or 2 times, and sprayed 1-2 times in the upper and middle of August. 2000 times 50% phoxim or 2000-3000 times 20% cypermethrin can also spray 1000 times 90% of trichlorfon solution and spray it from 7 to 10 days before fruit picking from late August to early September 50% dichlorvos 1000 times.
4, bagging protection. From the middle of June to the end of June, the second time after spraying, the fruits such as walnuts are protected by bagging. In order to prevent the insertion of larvae or eggs, the insect may be treated with a cotton ball or a ball containing medicinal mud and then bagged. It is no longer necessary to spray insecticides to protect the fruit after bagging.
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