论文部分内容阅读
今年,苹果市场价格下跌,造成一些果农放松了对苹果树的管理,树势下衰,苹果腐烂病发病率和重犯率增加。我作为一名果树科技工作者,看在眼里,急在心中,一方面,希望媒介单位,引导果农正视当前的形势,在提高果实品质上下功夫;另一方面,我们对苹果腐烂病病疤重犯的防治进行研究,以期能够引起果农的注意。 1.苹果腐烂病重犯的原因 ①发病部位树皮烂透以后,腐烂病菌丝侵入木质部,刮治时只刮树皮,未刮净木质部,木质部内的菌丝继续蔓延,侵染病疤四周树皮而引起重犯。经调查,此
This year, the decline in the market price of apples caused some farmers to relax the management of the apple trees. The decline of the trees, the incidence of apple-rot disease and the rate of recidivism increased. As a fruit tree worker, I was anxious in my heart. On the one hand, I hope that the media units will guide the fruit growers to face the current situation and work hard to improve their fruit quality. On the other hand, The study of prevention and treatment of recidivism, with a view to can attract the attention of fruit farmers. 1. Apple decay causes of rot ① the bark rot after the disease site, the rot of mycelium invades the xylem, scraping curettage only bark, unsplit net xylem, mycelium within the xylem continues to spread, infiltration around the scar Bark caused heavy offense. After investigation, this