论文部分内容阅读
在马来西亚,由橡胶白粉病病菌引起的第二次落叶实际上每年都广泛流行。根据过去五年间每年全国性病害调查所示,由于广泛种植主要以高产为选种目的而选育出来的现代品系,白粉病引起的第二次落叶已变得更为普遍和严重了。PB5/51、RRIM628和 PB28/59等高度感病无性系,在每年紧接越冬后的二、三月份必然会因此病而造成新抽嫩叶广泛脱落。在滨海的森美兰、马六甲和柔佛的中部及北部这些白粉病最盛行的地方,由于白粉病菌的反
In Malaysia, the second deciduous leaf caused by the powdery mildew pathogen is in fact widespread every year. According to the annual national disease survey conducted over the past five years, the second deciduous foliage caused by powdery mildew has become more common and severe due to the widespread cultivation of modern lines that have been bred largely for high-yielding purposes. PB5 / 51, RRIM628 and PB28 / 59 and other highly susceptible clones, in each year immediately after the winter in February and March will inevitably result in the disease caused by a wide range of new leaves off. In the coastal areas of Negeri Sembilan, Malacca and Johor, in the central and northern parts of the country where mildew is most prevalent,