Occurrence and Control of Citrus Suspension

There are many species of Heliothis virescens that harm the oranges. It occurs in a wide range, with many hosts and serious damage. The main damage is severe, such as the beaked larvae, moth larvae, larvae, dead leaf moths, and small bridge worms. Adults flew to orange trees at night, punctured the fruit with their mouth, and drew juice, causing the fruit to fall off or rot.

In the past, most of the citrus fruithoppers were found in mountainous areas and semi-mountainous areas, because their hosts are weeds such as wood, pine, buckwheat, and chestnuts. In addition, with the development of the fruit industry, such as pears, peaches, plums, oysters, bayberry, etc., are all its food, providing it with a sufficient food chain. Therefore, in recent years, the fruit-feeding moth has moved to the plains, exacerbating the damage to citrus and other fruits.

Citrus xylopithecus takes two to four generations a year, and many can reach 5-6 generations. It flies to the orchard at night to harm ripe orange fruit, and punctures the fruit with the mouth. Larvae do not harm the fruit and often take field weeds. Judging from the current prevention and control measures against fruit-feeding moths in the various citrus areas, the use of herbicides to control weeds (parasites of larvae), trapping and killing of larvae, hanging of crown canes, light trapping and crown spraying agents, etc., although they all have certain effects, It is difficult to really promote and apply it, and it is necessary to further explore if it is truly necessary to achieve significant prevention and control effects.

Prevention:

1, remove parasitic. The eradication of weeds, such as wood control, Hanfangji and Gaoliang bubbles around the orchard, or the extermination of herbicides, can reduce the damage of the main species Heliothis virescens, such as the beaked hawkmoth, and the moth. It is also possible to leave a small portion of host weeds and catch larvae. At the same time, do not plant cotton, jute, hibiscus, hibiscus and other crops near the ground in the orange garden.

2. The new orange orchard should be planted with mature varieties at the same time. It can't be mixed with early, middle and late-maturing plants, and can cut off the food chain of the fruit sucker, so as to reduce or avoid the harm degree.

3, fruit bagging. Early maturing varieties should be bagged in time. Before bagging, pesticide spraying should be used to prevent citrus rust ticks and prevent copper sickness from occurring later.

4, light trapping adult. According to the phototaxis of Helicoverpa assulta, black light, ultraviolet light, frequency-vibrancy insect killer lamp, or general electric light are installed in the orchard at a distance of 1.5-2m. The lights are higher than the canopy, the lights are placed in tubs, the basin is filled with water, and diesel or motor oil is added. Remove dead insects daily and change water every few days. Yellow light can also be set in the orange orchard, which can refrain from flying into the garden and reduce fruit damage. A flashlight illuminates the fruit at night, and the adults of the fruitworm are smoked.

5, drug trapping.

(1) Sugar vinegar: 8% sugar, 1% vinegar, and 0.2% trichlorfon.

(2) 2 parts of sweet potato caramel, 1 part of rice wine, 1 part of rotten orange fruit, 1 part of trichlorfon, and 20 parts of water.

(3) Poultice baits: soaked in 5% fipronil SC (Verdant) 1000 times, or 2.5% dichlorvos 5000 times, or 50% phoxim EC 30 times Tablets and so on. Then the soaked pieces of melon were hung on the top of the canopy, and the liquid was filled in pots. Each mu of orchard was put in a plum blossom shape of 5-6 pots to trap and kill the adults.

The lemongrass oil impregnated paper was hung on the orange trees on the perimeter of the orchard, and it had a repellent effect on the adults of the fruit sucking tobacco moth.

6, pharmaceutical control. The canopy was sprayed with 5.7% of Ukrainian eucalyptus cream 1000 times or with 300 times SK mineral oil added. Play a role of refusal, antifeedant, spray a drug, can be maintained for 10-15 days. Stop spraying before 20 days of fruit picking.

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