Walnut moths also known as walnut black. Is a Lepidoptera. Litigation moth family. In Shandong, Hebei. Shanxi, etc., takes place 1 generation per year, and occurs in 1 to 2 generations a year in Henan, southern Shaanxi, and Sichuan, especially in mountainous areas such as Hebei, Shanxi, Shaanxi, and Sichuan. The larvae eat walnuts and nucleolus, and the early young fruit is lost. After the hard nucleus, the skin becomes dark. The poor development of kernels and shrinkage affect the yield and quality of walnuts. When the damage is severe, the percentage of fruit damage is 60% to 80%, which is the main pest of walnuts in mountain areas. In general, May-June will be light in early years, heavy in May-June, heavy in mountainous areas, light in mountains, light in mountainous areas, heavy in cloudy slopes, light in sunny slopes, and heavier than in agricultural land. . The biological control measures are described below. For production applications.
One is spraying diflubenzuron to control the hatching larvae. Shanting District, Shandong Province for three consecutive years from 2008-2010. After the emergence of walnut moth adult eclosion, larvae hatched pods spray 20% diflubenzuron gel suspension 5000 times, sprayed once every 7d, and even spray 2 or 3 times, the fruit retention rate of 95% to 97%.
The second is the use of Steinern worms to control walnut limb moths. According to research. All the larvae of walnut aphid larvae were infected with Steinernema worms and all larvae became thicker after 3 days. It grows 2 to 3mm, becomes soft, and is full of live live worms. Field trials show. Walnut moths in late June and late August. For every 1m of the tree: Spraying 110,000 Steinernema scutellariae, the control efficacy was 55.6%-66.8% and 73.5%-75.0% respectively. The control effect of Steinernema scutellariae sprayed in late June and late August was 79.3%-80.9. %. The control effects of the perforating and perfusion method, ground pouring and spray method were 70.1%, 71.4% and 73.1%, respectively. There is no significant difference.
The third is the use of Bacillus thuringiensis to control walnut limb moths. China Agricultural Network has sprayed Bacillus thuringiensis, Helicoverpa spp., Bacillus spp., and 72l6 bacteria at a concentration of 200 to 400 million spores at the beginning of the adult emergence of the walnut moth, 4 to 5 days after the end of growth, and at the early stage of hatching and fruiting of the larvae. /nd. The fruit protection rate was 79.3% to 80.2%, 84.4% to 86.8%, 73.3% to 88.4%, and 82.6% to 84.9%, respectively.
The fourth is the use of Beauveria bassiana to control hatchling larvae. The Beauveria bassiana was sprayed before emergence of adult moths on the larvae and larvae were hatched. The concentration is 200-400 million spores/mL. When the air humidity reaches 80%, the fruit protection effect is 65%-80%. Particularly suitable for use in shady slopes and drains. Sunny slope should not be used.
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