Pear tumor moth, only for the pest of pear trees, also known as pear gall moth, pear branch gall moth, also commonly known as sugar gourd, pear knots, pear dogs, most of the pear production in China are distributed in the region, and the local area is quite serious, causing serious losses to fruit farmers.
The larvae of the pear moth are pest-like
The pest symptom of the pear gall moth is to infest the larvae moth into the branches as a pest, the affected branches form small tumors, the larvae live in it to bite, due to the results of years of pests, wood tumors in succession, shaped like sugar reeds. In orchards with poor pruning or many small trees, the damage is particularly serious, and the affected pear trees often affect the development of new shoots and the formation of the canopy. Before the new shoots infested by the larvae have formed a wood tumor, a leaf near the moth hole is yellowish and easy to identify.
The pear tumor moth is harmful
Adults of the pear moth are 5 to 8 mm long, with a wingspan of 12 to 17 mm, grayish yellow to grayish brown, silvery luster, black compound eyes, gray-yellow lower lip, and brown spots on the outside of the terminal segments.
At 2/3 of the forewings there is a large narrow triangular gray-white spot, with a black longitudinal stripe in the middle and on the inner and outer sides of the spot, and 2 black spots composed of vertical phosphorus, 1 at the end of the middle chamber and 1 on the middle gluteal vein, with gray margins.
The hindwings are greyish brown , without markings , with long marginal hairs ; the feet are grayish brown , with white rings at the end of the appendages , and the tibia of the hind feet are densely covered with yellow hairs. The ovary is simple in shape, 0.5 mm high and 0.3 mm in diameter, and is orange-yellow at the beginning, turning brown near hatching, with longitudinal stripes on the surface. When mature, the larvae are 7 to 8 mm long, yellowish-white, with a small head, a hypertrophied carcass, and a black head and dorsal plate of the forebreast.
The whole cloth is yellowish white fine hairs, with slightly longer hairs on the head, thorax and caudal end of the body segment and more than 5 to 6 mm long, initially light brown, near feathering the head and thorax become black, can clearly see the developed antennae and wings extended to the end of the abdomen, the end of the abdomen has two protrusions to the ventral surface.
Pear tumor moth generally occurs 1 generation a year, to Burma in the infested tumor overwintering, pear bud germination when the adult insect begins to feather, flower buds bloom before the feathering of the peak period, after feathering adults early spread quietly on the twigs, in the sunny day windless afternoon that begins to be active, in the evening is more active, can the tree fly and spawn, eggs are laid in the coarse skin, buds and wood tumor gaps and branches of the skin slits, etc., eggs scattered, but there are also several grains together, each eagle worm lays about 90 eggs.
The egg stage is longer, 28 to 20 days. After the new shoots grow, the eggs begin to hatch, the hatching larvae are very active, looking for newly extracted young branches to moth into the pest, the victim gradually expands into a tumor, the larvae eat in a vertical and horizontal series of food in the tumor, and the excrement is also stored in the tumor. There are 1 to 4 larvae in each tumor, and the larvae are infested in the tumor until mid-to-late September, and the pupae previously bites a hole from the tumor outwards, and then pupates through the winter.
Pear gall moth is harmful
The hatching of pear gall moth eggs is very closely related to the growth phenology of pear tree new shoots, and the extraction period of pear new shoots is also the period when its larvae are infested, so the growth of new shoots and the formation of the canopy are seriously affected.
Fifth, prevention and control methods
1. Artificial control Complete pruning of the pest tumor has a good effect, pay attention to only pruning the l-year mycoccosis with overwintering pupae inside, and the old insectoma can be pruned year by year, so as not to affect the tree potential too much by branch loss.
Victim pear branches like "sugar gourds"
2. Biological control Collect the gall branches cut during the winter shearing and put them in a cage made of iron mesh, wait for the parasitic bees to fly out in the spring, and eliminate the pear medium moth in the cage.
3. Drug control during the occurrence of adult insects, can be sprayed 1 or 2 times 50% malathion 1000 ~ 1500 times liquid, can receive good results in the adult spawning in large numbers and the initial incubation period of larvae, spray 50% borer thiophos emulsion 2000 times liquid once, which is also very effective for egg killing and hatching larvae.
Related anti-treatment agents
The introduction of pear tumor moth shared today is so much, about more fruit tree disease and pest control measures can pay attention to me, will update the new method of fruit tree management from time to time. If you have better methods and suggestions, please leave a message in the comment area, and will reply to you at the first time to discuss and communicate together.