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2000年,因受气候等因素的影响,烟威地区苹果园病虫发生呈现新的增长趋势。对此,我们进行了探讨和研究。 一、8月下旬轮纹烂果病呈加重发生 去年苹果价格大幅度下滑,果农经济收入显著下降,导致果农对休眠期的病虫害防治重视程度不够,不少果农几乎不喷药。即使在病虫发生期,与往年相比,果园投入也大大降低。这为后期病虫害的泛滥埋下了隐患。对轮纹烂果病应抓住早期防治,幼果期是轮纹病菌侵染潜伏期。果实茸毛脱落前后,应以内吸性杀菌剂为主,以把侵入果实内的病菌杀死。然而,2000年有不少果农不喷药,或只用价低质差的劣质农药,加上今年干旱,许多果农产生麻痹心理,导致大量轮纹病菌侵入幼果内潜伏下来。8月份以后,当果实糖度升高,酸度及抑制病菌繁殖的酚类浓度下降时,潜伏在果实内
In 2000, due to the influence of climate and other factors, pest occurrence in apple orchard in the area of Yanwei showed a new growth trend. In this regard, we conducted a study and research. First, in late August rotten rot disease was aggravated Occurred last year, a sharp decline in apple prices, fruit farmer’s economic income dropped significantly, resulting in the peasants on the dormant pest control attention is not enough, many farmers almost no spray. Even in the pest and disease occurrence period, compared with previous years, orchard investment is greatly reduced. This laid the hidden danger for the spread of pests and diseases later. The rotten fruit rot disease should seize the early prevention and control, young fruit rot is infected with the incubation period. Before and after the fruit hair loss, systemic absorption of fungicides should be the main, in order to kill the bacteria invade the fruit. However, in 2000, many peasants did not spray pesticides or only used poor quality and poor quality pesticides. With the drought this year, many fruit farmers were paralyzed, causing a large number of rotten pathogens to invade the young fruit. After August, when the fruit sugar content increases, the acidity and inhibitory bacteria proliferation of phenolic concentration decreased, lurking in the fruit