There should be many fruit growers and friends who know about peach borers, and the damage to peaches is very serious, and the fruit that is affected has basically no edible value, let alone how commercial.
But there are also peach borers on the pear tree do not know how many people know, and also the same harm to pear fruit, many fruit farmers will mistake it for a heartworm and other pests, many times the prevention is not satisfactory, there is no targeted prevention, all it is necessary to popularize the science of this "trickster".
Peach borers harm pear fruit
First, the distribution and host of the peach borer, also known as the leopard striped borer, belongs to the family Offidontidae, which is distributed in the north and south of China. The larvae are the fruits of fruit trees such as peaches, pears, apples, apricots, plums, pomegranates, grapes, hawthorns, chestnuts, loquats, etc., as well as crops such as sunflowers, corn, sorghum, hemp and trees such as pine and juniper, and are omnivorous pests.
Peach borer infested pear fruit
Second, life habits From north to south in China, 2 to 5 generations can occur in 1 year. Henan occurs for 4 generations a year, with old mature larvae overwintering in bark cracks, zombie fruits, corn stalks, etc. In mid-April of the following year, the old mature larvae begin to pupate. The generations of adults are feathered in mid-May, the first in mid-July, the second in early to mid-August, and the third in late September.
Adults lay quietly on the back of the leaves during the day and lay eggs at night at the junction of the two fruits. After the larvae hatch, they mostly enter from the calyx and can turn 1 to 3 fruits. Pupae are mostly in calyx depressions, where the two fruits meet and where the branches are crevices, etc., with white silk cocoons.
Peach borer multiple larvae harm pear fruit
Third, for the symptoms of harm The peach borer on the pear tree often begins to nibble on the peel from the next two fruits to invade, and then moths into the fruit, after the fruit is killed, the moth hole is piled up outside the worm dung, the victim fruit often changes color and falls off or swells, and there is usually a larva in the affected pear fruit.
Peach borer borer larvae harm pear fruit
IV. Morphological characteristics The adult body length of the peach borer borer is 9 to 14 mm, the whole is yellow, and the forewings are scattered with 25 to 28 black spots. The male has a black abdomen. The ovoid is oval in shape, 0.6 mm long, milky white at first birth and later reddish brown.
When the larvae are mature, they are 22 to 27 mm long, the back of the body is dark red, and the body segments have large brown hairs. There are 4 hairy patches on the back of each segment of the abdomen, the first two are larger and the back two are smaller. The pupa is about 13 mm long, yellowish-brown, with a row of small spines on each of the 5th to 7th segment of the abdomen, and 6 slender curved spines at the end of the abdomen. Cocoon gray-brown.
Peach borer adults
Sixth, prevention and control methods
1. Remove the source of insects In winter and spring, remove the remains of corn, sorghum, sunflowers and other remains, and bring the old bark of pear trees out of the park to be burned centrally to reduce the source of insects.
2, artificial prevention of pear fruit using kraft paper bagging, in order to achieve the prevention and control of peach borer borer fruit hazards.
3. Pharmaceutical control The favorable timing of drug treatment of insects is in the early incubation stage of the first generation of larvae (late May) and the incubation period of the second generation of larvae (mid-July). Effective agents can be used: cypermethrin, cypermethrin, propyl bromide, cypermethrin, etc. are selected for use.
Peach borer borer larvae infest within the pear fruit
The above is the introduction and control methods of the pest peach borer on the pear tree, and I hope that the pear tree growers who see this article can prevent it in advance before the next insect outbreak, and do not wait until they have been harmed to attract attention. Fruit tree planting must remember one sentence: three points, seven points.