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I. The situation of black light moths The mothworm: Frequent vibrations reported that moths were seen on April 17th, 5 days earlier than normal years, and there were 2601 moths attracted on June 26th, including 1839 female moths, 762 male moths, and females: Male = 2.41:1, the moth peaks from June 14 to June 23, the peak period is from June 16 to August 18; Tigers: See the moth on April 17, 33 days earlier than last year, until June 26 There were 3378 moths, of which 1926 were females, 1452 males, and 1.33:1 males. The peaks and peak periods of the moths were synchronized with those of the armyworm. Both of them had seen moths as early as last year and had a high sex ratio.
Second, the environmental conditions due to low temperature and low illumination time in spring this year, the growth period of wheat is 7-10 days later than usual, resulting in the delay of autumn sowing. At present, there are still some fields not sown. The corn planting area in the north of the city and the city in the west is in the period of 2-4 leaves, which provides sufficient food sources and favorable living environment for the armyworm and land tiger.
3. Meteorological conditions Meteorological department forecasts: During the flood season, there will be a rainfall process in recent days, and the relative humidity will increase, which is conducive to the spawning, hatching, and survival of newly hatched larvae of armyworms and ground tigers.
Control indicators: corn seedlings damage rate of 10%, cotton, sweet potatoes, 1 to 2 instar larvae of vegetable fields 0.5 ~ 1 head / square meter.
Control methods:
1. Weeding and disinfestation: Weeds are the main spawning grounds for armyworms and floorworms, and bridges where larvae transfer damage to crops. Therefore, timely weeding can kill large numbers of eggs and larvae.
2, poison bait trapping: 5% helmsman granules a bag of fine sand mixed with 10 kg spread around the seedlings, and then cultivator. Or use 90% of trichlorfon crystals, 50% of phoxim EC 1 kg, add 5~10 kg of water, mix crushed young grass or crushed 100 pounds of sauteed cotton cake, spread in the evening near the seedling root, mu Cake fat, bait 8 to 10 pounds, has a better trapping effect on older tigers.
3. Spray control: Elimination of larvae before 3rd instar. Mu with a power attack or 2.5% Saffron chrysanthemum 40 ~ 50 grams or wild, Ning caught 15 ~ 20 ml and other optional spray control, can effectively control the damage of armyworm and floor tiger.
Pay attention to the second generation of checkworms and tigers
The armyworm and ground tiger are omnivorous pests. The second generation can endanger summer corn, cotton, vegetables, and other crops in our city. Each year causes various degrees of damage, and is the main pest in production. The armyworm eats leaves and young tissues. When it is heavy, the leaves eaten and the tender part bite. The ground tiger mainly eats the stem base of the seedlings, causing the seedlings to die, causing the seedlings to become ridged, and even destroying the seedlings in severe cases. The influence of crop growth and development is greater. It is estimated that the occurrence of the second generation of armyworms and earthworms in the city this year will be moderately serious; the endangered period will be from the end of June to the beginning of July. Its basis is: