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为了探讨较佳种植密度,为甘蔗主要病虫害的综合防控提供技术支持,以桂糖37号和桂糖40号为材料,设置5个不同种植密度:11.61、13.58、15.72、17.87和20.01万芽·hm-2,研究种植密度对甘蔗主要病虫害的影响。结果表明,下种量密度对桂糖37的出苗数有明显的影响,当下种量为17.87万芽·hm-2时,出苗数最多。而下种量密度对桂糖40的出苗数没有明显影响。两个品种的出苗率均随着下种量密度的增加而逐渐降低。种植密度对2个甘蔗品种新植蔗的黑穗病发生无明显影响。随着下种量增加,桂糖37梢腐病的发生逐渐加重,然后减轻。桂糖40甘蔗梢腐病较轻,规律不明显。2个品种的花叶病均表现为随着下种量的增加,呈先增加后降低。但2个品种的枯心率均随着下种量的增加而不断上升。相关性分析表明,下种量分别与螟害枯心苗率和出苗数呈显著正相关。种植密度对甘蔗梢腐病、花叶病和螟害均有明显的影响。
In order to explore the optimal planting density and provide technical support for the comprehensive prevention and control of the main pests and diseases of sugarcane, five different planting densities of 11 Gui 37 and Gu Guosi 40 were set as 11.61, 13.58, 15.72, 17.87 and 2.01 million buds · Hm-2, to study the effects of planting density on the main pests and diseases of sugarcane. The results showed that the seedling density had a significant effect on the seedling emergence of Guitang 37, with the highest seedling emergence when the seed germination rate was 1787800 hm-2. However, the seed density did not significantly affect the emergence rate of Guitang 40. The emergence rate of the two cultivars decreased with the increase of the lower seedling density. Planting density had no significant effect on smut of two new sugarcane varieties. With the next increase in the amount of, Gui sugar 37 rot disease gradually increased, and then reduce. Gui sugar 40 sugarcane shoot rot is light, the law is not obvious. Mosaic disease of the two cultivars showed an increase first and then a decrease with the increase of the next species. However, the dry heart rate of the two cultivars increased with the increase of the next seedling. Correlation analysis showed that the lower seedling weight was significantly and positively correlated with the number of seedling emergence and the number of seedling emergence per plant. Planting density of sugarcane shoot rot, mosaic disease and borer have a significant impact.