A field survey at the end of June found that corn cultivars, sunflower pods, were found in some corn fields in Yanqing County, Beijing. Three sites were surveyed, and two of them found worms and caused damage. In general, the number of single plant insects was 1-8, and more than 10 were headed. The most serious part occurred. The damaged corn plants were short and the leaves were yellow, and some of the whole plants died, posing a threat to corn production.
Characterization, Morphological Identification, Occurrence and Prevention and Control Methods of Maize Agrimony Communities
1, damage characteristics: the female and nymphs in the ground near the leaf sheath and root sucking the host's sap, intensive damage, causing damage to the corn plants dwarf, yellow leaves, growth and development, the lower leaves dry or rough roots, resulting in full The plant withered and died.
2, morphological characteristics: Female adult body length 3-4.2mm, width 1.4-2.1mm, flat oblong, both sides of the edge close to parallel, red-brown, all covered with white wax powder. Male adults are small, dark yellow-brown.
3, the law of occurrence: corn cultivating sunflower powder in addition to damage to corn, but also damage wheat, sorghum and other grass crops. Three generations occurred in Hebei in one year, and the second generation took a long time and was seriously damaged. In the middle of June to early August, it mainly damaged summer maize seedlings. The wintering of the eggs in the oocysts is attached to the corn roots in the field or the remaining straw in the soil. The adult females lay their eggs during the winter from September to October every year, and the hatching starts at about 17°C in the middle and late April of the following year. The 1st instar nymph was lively and did not secrete wax powder, which was the best period for chemical control. After the 2nd instar, it began to secrete wax powder, and was damaged in the ground or in the lower leaf sheath of the plant.
4, prevention and control methods: (1) rotation down. Planting beans and cotton in heavily damaged plots. (2) eliminate insect sources. After wheat and corn are harvested, they are ploughed and ploughed, cultivated and weeded, and the root hoe is taken out of the field. (3) Chemical control. Control period 1st nymph stage, watering 40% phoxim EC 500-1000 times or 10% imidacloprid WP 2000 times, 1.8% avermectin EC 3000 times.
Characterization, Morphological Identification, Occurrence and Prevention and Control Methods of Maize Agrimony Communities
1, damage characteristics: the female and nymphs in the ground near the leaf sheath and root sucking the host's sap, intensive damage, causing damage to the corn plants dwarf, yellow leaves, growth and development, the lower leaves dry or rough roots, resulting in full The plant withered and died.
2, morphological characteristics: Female adult body length 3-4.2mm, width 1.4-2.1mm, flat oblong, both sides of the edge close to parallel, red-brown, all covered with white wax powder. Male adults are small, dark yellow-brown.
3, the law of occurrence: corn cultivating sunflower powder in addition to damage to corn, but also damage wheat, sorghum and other grass crops. Three generations occurred in Hebei in one year, and the second generation took a long time and was seriously damaged. In the middle of June to early August, it mainly damaged summer maize seedlings. The wintering of the eggs in the oocysts is attached to the corn roots in the field or the remaining straw in the soil. The adult females lay their eggs during the winter from September to October every year, and the hatching starts at about 17°C in the middle and late April of the following year. The 1st instar nymph was lively and did not secrete wax powder, which was the best period for chemical control. After the 2nd instar, it began to secrete wax powder, and was damaged in the ground or in the lower leaf sheath of the plant.
4, prevention and control methods: (1) rotation down. Planting beans and cotton in heavily damaged plots. (2) eliminate insect sources. After wheat and corn are harvested, they are ploughed and ploughed, cultivated and weeded, and the root hoe is taken out of the field. (3) Chemical control. Control period 1st nymph stage, watering 40% phoxim EC 500-1000 times or 10% imidacloprid WP 2000 times, 1.8% avermectin EC 3000 times.
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