ASSESSMENT OF BLAST DISEASE AND YIELD LOSS IN SUSCEPTIBLE AND PARTIALLY RESISTANT RICE CULTIVARS IN 2 IRRIGATED LOWLAND ENVIRONMENTS
ASSESSMENT OF BLAST DISEASE AND YIELD LOSS IN SUSCEPTIBLE AND PARTIALLY RESISTANT RICE CULTIVARS IN 2 IRRIGATED LOWLAND ENVIRONMENTS
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DOI：
10.1094/pd-75-0462
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发表时间：
1991-05-01
期刊：
影响因子：
4.5
通讯作者：
LEE, EJ
中科院分区：
文献类型：
--
作者：
BONMAN, JM;ESTRADA, BA;LEE, EJ
稻瘟病的重要性，由Pyricularia pyramidae引起，随环境而变化，在韩国的灌溉低地水稻比在菲律宾的灌溉低地水稻更容易发生这种疾病。 部分抗病品种可以减少稻瘟病的损失。 使用杀菌剂保护和接种的田间小区来评估局部适应的部分抗性品种在减少叶瘟、颈瘟和产量损失方面的有效性。 在1987年至1989年进行的6次试验中，产量损失与严重颈瘟的发生率呈正相关（r2 = 0.95）。 在菲律宾的部分抗性品种IR36和韩国的Seomjin中，颈瘟的发生率低，产量损失可以忽略不计。 菲律宾品种IR66对穗颈瘟有部分抗性，但对叶瘟无抗性，穗颈瘟发病率低，产量损失低。 部分抗病品种Bonggwang在韩国表现出中度颈瘟发病率为16.2%，产量损失为31.2%。 在菲律宾的IR50和韩国的Daechang中，在易感检查中测得的最大损失分别为20.9%和50.2%。 在菲律宾灌溉条件较差的低地，仅部分抗性就可用于控制稻瘟病。 在韩国的高强度栽培条件下，只有部分抗性高的品种才能单独有效，抗性较低的品种可能需要使用额外的栽培和化学控制策略。
The importance of blast disease, caused by Pyricularia oryzae, varies with environment, and irrigated lowland rice in Korea is more prone to the disease than irrigated lowland rice in the Philippines. Rice cultivars with partial resistance can reduce losses from blast. Fungicide-protected and inoculated field plots were used to assess the effectiveness of locally adapted partially resistant cultivars in reducing leaf blast, neck blast, and yield losses. Over six trials conducted from 1987 to 1989, yield loss was positively correlated with the incidence of severe neck blast (r2 = 0.95). The incidence of neck blast was low and yield losses negligible in partially resistant cultivars IR36 in the Philippines and Seomjin in Korea. Philippine cultivar IR66, which has partial resistance to neck blast but not to leaf blast, also showed a low incidence of neck blast and low yield losses. Partially resistant cultivar Bonggwang showed intermediate neck blast incidence of 16.2% and yield loss of 31.2% in Korea. The maximum losses measured in the susceptible checks were 20.9% in IR50 in the Philippines and 50.2% in Daechang in Korea. Under the less conducive irrigated lowland conditions in the Philippines, partial resistance alone can be used to manage blast disease. Under the highly conductions in Korea, only cultivars with high levels of partial resistance will be effective alone, and cultivars with lower resistance may require the use of additional cultural and chemical control tactics.