What is the one- and two-point nocturnal moth?
The two-point nocturnal moth belongs to lepidoptera, molts 5 times in the larval stage for a total of 6 years, afraid of light and high temperature, diurnal and nocturnal, and has the harmful characteristics of the plant! The larvae are heterogeneous and can feed on more than 30 species of plants in more than 13 families, mainly endangering summer corn in our land. Since 2005, its larvae have been found to be harmful to summer corn, and in 2011, the Huanghuaihai summer corn area suddenly broke out, (2014 was also the outbreak year in our county) resulting in the destruction of large areas of summer corn (the reported harm area reached 40 million mu). And because the site and appearance of the victim are very similar to the tigers in the small land, sometimes farmers often misidentify it.
Adult 2-point nocturnal moth (one black and one white dot on the forewing)
Two-point nocturnal moth larvae and identification points
Similar pest small ground slot machine identification points
Comparison of the morphology of the two-point nocturnal moth with the small ground tiger
What are the dangers of the two-point nocturnal moth to corn?
The two-point nocturnal moth mainly harms corn seedlings with larvae hiding under the broken wheat straw around the corn seedlings or in the topsoil layer of 2-5 cm, mainly nibbling on the base of the corn stem, and the following symptoms can be formed according to the growth period of corn:
2-3 leaf stage hazards cause maize seedlings to die from root bites
3-4 mm voids form at the base of the stem of moth-fed corn at the 3-6 leaf stage, resulting in wilting and death of corn heart leaves
At the 7-10 leaf stage, bite the secondary root or main root of corn, causing lodging, severe death, if not controlled, it will lead to a large shortage of corn seedlings, seriously reducing yield!
When does the three-o'clock nocturnal moth occur?
The two-point nocturnal moth generally occurs more in the summer corn field of wheat stubble, and the distribution of pests in the field is uneven, but the edge ridge near the ridge is serious, and the general flaky hazard area is about 4 square meters! The investigation found that the wheat straw bran cover was serious, the cotton and wheat flower arrangement field was serious, the sowing was serious, and the sowing ditch was shallow. Generally, mid-June is the peak of the occurrence of overwintering adults, and in late June and July, the larvae hatched by the overwintering adults spawn and eat the base of the maize seedling stem.
What are the favorable conditions for the occurrence of the fourth and second point nocturnal moths this year?
1: Most of the wheat harvest period in our region this year is similar to the peak period of adult occurrence,
2: Most of the maize seedling stage in our county coincides with the larvae of the two-point nocturnal moth;
3: Last year's winter temperature is higher than usual, precipitation is less than usual, winter climatic conditions are conducive to the safe wintering of the two-point night moth, according to the monitoring points, this year we saw moths early, moths large;
4: Compared with last year, the yield of wheat in our land this year is significantly higher than last year, mainly because the population is generally increased, compared with last year, the wheat bran in the field is thick and the wheat straw is thick, which is very conducive to the occurrence of the two-point nocturnal moth.
5. Prevention and control
The key methods that should be mastered in the prevention and control: early prevention and early control should be mastered in the prevention and control work, and the prevention and control should be started immediately when it is found that there are individual plants in the field that are tilted.
1. Agricultural measures: timely remove wheat straw, weeds and other mulch at the base of corn seedlings, promote stubble eradication and sowing, and eliminate the favorable environmental conditions for their occurrence. Be sure to remove all the wheat bran straw covered in the corn ridge to the corn rows away from the plant and expose it to the ground so that the agent can directly contact the two-point night moth. It is only the prevention and control of the whole field medicated spray instead of the non-smooth ridge irrigation root, and the corn field prevention and control effect of the root of the whole field agent that does not clean the wheat straw and wheat bran is slightly worse. The best way to control it: after cleaning the wheat straw bran, use a motorized sprayer to adjust the spray gun into a column of water to spray the corn root directly. At the same time, it is necessary to cultivate soil and support seedlings. For large seedlings that have fallen, while actively removing insects, we should not destroy the seedlings, but should cultivate soil to support the seedlings, and strive to promote the future of qi rooting and robustness, and restore normal growth.
2, chemical control: the main methods are Xianzheng Da Fu Liang seed mixing, spray, poisonous bait, poisonous soil, watering and so on. When spraying the herbicide before spraying, a mixture of permethrin or methylphenidate can be added to spray, and the number of insect mouths in the later stage can be greatly reduced after application! In addition, after many years of multi-point drug virulence measurement test, it was found that after the emergence of seedlings, it was found that the poison bait method was the best effect when the pest control was found, and the operation was simple, time-saving and efficient!
Article source: Golden Autumn Qian Village