论文部分内容阅读
根据西安地区蔬菜栽培的实践经验,各种不同程度的气象灾害,直接危害蔬菜生长,但更重要的是导致病虫害的发生流行,特别是黄瓜霜霉病、番茄条斑病毒病和番茄晚疫病等毁灭性病害的大流行,常会造成黄瓜、番茄大幅度、大面积的减产,甚至不少田块毁灭,因而严重影响到市场供应。一、黄瓜、番茄严重减产的主要气象灾害(一)4月中、下旬雨水偏多:当地谷雨前后常有较大的降雨量,有些年份提前到4月中旬。4月中下旬雨水偏多,拖延了番茄、黄爪的定植期,或造成黄
According to the practical experience of vegetable cultivation in Xi’an, various degrees of meteorological disasters directly endanger the growth of vegetables, but more importantly lead to the occurrence of pests and diseases, especially cucumber downy mildew, leaf streak virus and tomato late blight A pandemic of devastating diseases often results in the curtailment of cucumbers and tomatoes in large scale and in large scale, and even the destruction of a large number of plots, thus seriously affecting the market supply. I. Major Meteorological Disasters of Cucumber and Tomato Severely Reducing Production (I) More rain in mid-April and late-April: Larger amount of rainfall usually occurs in front of and behind the valley and in some years earlier in mid-April. More rain in mid to late April delayed the planting of tomato and yellow claws or caused yellowing