Recently, a farmer sent a picture to inquire, his family's navel orange was stationed by insects, the fruit was yellow, and the shedding was more serious.
Because the first few pictures were relatively blurry, I took it for granted that it was a citrus maggot (real fly larvae), but the few pictures that this friend sent later made me put away this bold idea.
Here is a relatively clear selection, you can see that this insect is well-proportioned, the head features are obvious, and the head is far from the thick head and tail of the maggot.
What kind of worm is it?
Do not sell Guanzi, this worm is a peach borer, the host is quite a lot. In the past, crops such as peach, plum, pear, sorghum, sunflower and corn were mainly harmful, but in recent years, it has also occurred occasionally on pomegranates, grapes, longan and citrus.
Larvae: white to beige in body color, slightly pink on the back, reddish brown head, and 18 to 25 mm long in mature larvae.
Pupae: 12 to 14 mm long, 3 mm wide, brown or dark reddish brown, covered with a thin gray-white cocoon.
Adults: 9 to 14 mm long, 20 to 26 mm wingspan, yellow to orange-yellow, some grayish yellow, and many black spots of different sizes on the dorsal, forewings, and hindwings.
The harm of peach borers to citrus
Similar to the damage of fruit flies, the worm feeds on the fruit as a larvae and feeds on the fruit. However, unlike the fruit fly, the peach borer adult generally lays its eggs on the fruit, so there is usually only one worm in a fruit, but in the area where the big fruit fly occurs, it is sometimes mixed.
Peach borers do not have transfer hazards on citrus, insect feces are yellow-brown granular, distributed around the borer holes, the affected fruit trees are yellowed before ripening, early fall, and some of the unfavored fruit is soft and rotten at the moth.
Characteristics of the occurrence of peach borers on citrus
(1) The host of peach borer borer is extremely wide, and the damage to citrus is generally the 3rd and 4th generation larvae, so the nearby orchards with former stubble hosts such as corn occur more heavily.
(2) The insect mainly harms medium-ripening varieties, and no victims are found in early and late-maturing varieties.
(3) Different varieties suffer different degrees of harm, such as in the mixed planting areas of navel orange, orange and orange, the harm of orange is lighter, and the honey orange is not affected, but the navel orange is seriously affected.
(4) Orchards have large planting density, many weeds, and serious concealment. The resistance between varieties varies greatly, and the occurrence of open umbilical varieties is more serious than that of closed umbilical varieties.
Comprehensive prevention and control of peach borer borer
Agricultural control: remove overwintering larvae, burn corn, sorghum straw and residual plants around the orchard, and scrape off the bark of the trunk to make the larvae freeze to death; for adult orchards, they should be cut down or reasonably thinned, increase ventilation and light transmission, and create a small ecological environment that is not suitable for adult insects to lay eggs; from June to July, black light lamps or frequency vibration insecticidal lamps or sweet and sour liquor are set up in the orchard to trap adult insects; for the fruit that has fallen off in time, the concentrated treatment of the fruit that has fallen off is picked up in time to eliminate the larvae in the fruit.
Biological control: protect or release natural enemies of insects, such as velvet cocoon bees, large-legged wasps, hugging wasps, etc.; raw grass cultivation to provide habitat for beneficial organisms.
Chemical control: in the peach borer 3rd and 4th generation larvae hatching drug protection, optional use of imidacloprid, methyl vitamin salt indinavirus, chlorpyrifosyl chlorpyrifolide, cypermethrin, etc. For serious occurrences, it should not be limited to citrus, and other 1st and 2nd generation host crops such as peaches and corn should also be prevented and controlled in a timely manner.
#谷丰计划 #
This article comes from the agricultural assistant, please indicate when reprinting, and do not modify the content of the article, the modification must be investigated! This article is the 234th article in the series "Making Agricultural Technology Simpler, Making Popular Science More Popular"