In recent years, candle grass has invaded and spread to wheat fields in some areas, and has become the main malignant weed in wheat fields. The candle stalks are erect, the leaves are flat, and the panicles are compact and columnar. They are shaped like candles. When they are young, they turn green and become yellow after ripening. This plant prefers a warm, humid climate with poor drought resistance. It grows most lush in moist loam or clay. So how do you recognize the candle grass? What are the prevention measures?
First, the harm and identification of candle grass
1, the harm of candle grass
It has become the main malignant weed in many parts of Shaanxi Province. It has become a malignant weed in the middle and lower reaches of the Yangtze River, which is second only to the sedge and the maiden. In the Xuzhou area of ​​Jiangsu Province, the difficulty of elimination has gradually increased. In addition, the ghost candle can be used as the host plant of wheat bush dwarf virus and oat cyst nematode, the former can cause wheat bush dwarf disease, the latter can cause cyst nematode disease. Affecting the robust growth of wheat poses a serious threat to the stable yield and high yield of wheat.
2, the identification of candle grass
The name of the candle, alias "ghost candle", "fake look Mai Niang", plant height 15-50 cm, stalks, erect or oblique, with 3-4 knots. The leaves are flat and multi-slanted upward; the sheath is shorter than the internodes, and the leaves are membranous. The panicles are tightly cylindrical, 0.8-10 cm long and 4-8 mm wide, and become yellow after maturity. The small spikes are wedge-shaped or obovate, the outer lemma is ovate, and the inner iliac is several longer than the outer lemma. Yingguo is small. Touching the candle plant will give off an easy-smelling aroma.
Second, the law of the occurrence of candle grass
It usually emerges from September to October every year. It blooms from April to June in the next year, seeds are propagated, and the seedlings are wintering. Ghost candle seeds have large fruiting capacity (1500-2900 grains per plant), small volume, easy to spread, and seed germination has wide adaptability to environmental conditions such as temperature, light, pH and salt.
Third, the prevention and control measures of the candle grass in the wheat field
1. Block or reduce the possibility of ghost candle seeds invading the wheat field on the roadside. Chemical treatment can be carried out before the maturation of the ghost candle seeds on the Tianji Road, reducing the input of the number of seeds in the field.
2. Grasp the best prevention period in the seedling stage. Generally, in late October and early November, the seed germination and emergence of ghost candles are carried out, and they are blocked or sowed before sowing with isoproterenol, chloromeron, piracetamide, pendimethalin, propidium and other agents. Processing in front of you. At this time, most of the weeds in the wheat field, such as valerian, bluegrass, and stalk grass, are germination and can be treated together.
3, grasp the key period of treatment of green leaves and stems before and after winter. Before winter, before the wheat is greened, before the jointing, the ghost candle is around 3 leaves, and the stems and leaves are treated with acesulfame, clodinafop, trimethoate, isoproturon, oxazolone, flufensulfuron and the like. The agent can better control the occurrence and spread of ghost candles.
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