preface
The bridge moth occurs in 6 generations per year, overwintering with larvae and pupae. The high bee stages of each egg generation occur in early April, mid-May, late June, mid-July, late August and mid-September. The hosts of bridge moth larvae are the field berry, sorghum bulb and wild chestnut. Larvae and pupae usually have higher survival rates and lower eggs, and egg hatching rates vary significantly between generations, with the first generation being the highest at 82.3 percent and the fifth generation being the lowest at just 11.1 percent. One of the main reasons for the low egg hatching rate is the large number of parasitic wasps, especially in July and September, although the number of eggs is large, but due to the high parasitic rate of parasitic wasps, there are not many larvae that can hatch. Therefore, the bridge nocturnal moth is usually not harmful to citrus.
Jiangxi Ren's fruit industry Nanfeng mandarin orange
First, the morphological characteristics
Adults are 16–17 mm long, have a wingspan of 35–38 mm, and are antennae filamentous. The body and forewings are yellowish brown and the hindwings are greyish brown. The forewings are slightly drooping at the tip of the wing, and the middle of the outer edge protrudes into a sharp horn. When the two wings are combined, they have an arched bridge pattern, and each wing has 3 black dots. The eggs are pale yellow, oblate spherical, protruding at the apex, flat underside, about 0.6 mm in diameter, and have longitudinal stripes on the shell. The larvae are bluish green, about 37 mm long, with 4 pairs of gastropods, the first pair is the smallest, the second pair is slightly smaller, and the third and fourth pairs are developed. The pupa is tan and about 18 mm long.
Second, prevention and control methods
The control of bridge moth should be mainly based on ecological regulation and physical control, supplemented by pharmaceutical control.
1. Rational planning of orchards
When developing citrus in mountainous and semi-mountainous areas, it should be planted in large areas, and try to avoid mixing varieties or varieties of fruit trees with different ripening stages.
2. Eradicate larval hosts
In May and June, the herbicide Anti-Nail Agent No. 1 is applied to the stem (Wood Defense) or the Anti-Nail Agent No. 2 Spray is used to completely eradicate the Wood Defense and Han Defense in and around the citrus orchard within 1 km.
Jiangxi Ren's fruit industry granulated sugar orange
3. Refusal to avoid
Use 5-10 sheets of absorbent paper per tree, 1 ml of lemongrass oil per drop, and hang around the canopy in the evening, or wrap the naphthalene balls in plastic film, with several small holes on the thorns, and hang 4-5 capsules per tree.
4. Biological control
Around July, red-eyed bees are bred in large numbers, released around citrus groves, parasitic nocturnal moth ovaries.
5. Pharmaceutical prevention and control
Spray 5.7% cypermethrin emulsion or 2.5% cypermethrin emulsion 2000-3000 times solution at the beginning of the infestation. In addition, booby traps with banana or orange fruit soaking (20 times the liquid of the enemy worms) or artificially killing adult insects at night also has a certain effect.
Jiangxi Ren's fruit industry red meat navel orange