摘要
采用在植株上接种不同浓度的丝黑穗病菌、弯孢菌叶斑病菌和玉米大斑病菌,以及不同玉米螟虫量,研究不同病级和虫量对玉米的产量构成因素及产量损失的影响,同时对玉米螟(A)、弯孢菌叶斑病(B)、大斑病(C)、丝黑穗病(D)的复合发生为害(ABCD)损失和经济阈值进行简单探讨。研究表明,病虫为害主要影响穗粗、行粒数和百粒重产量构成因素,病级和虫量与产量损失呈显著正相关;病虫之间存在复合为害关系,复合产量损失率占四者单独造成产量损失率之和的41.48%,其大小依次为:A<C<B<D<ABCD<(A+B+C+D),并组建了复合为害损失及复合经济阈值模型。
The thesis adopt the inoculation method, studied the maize yield loss and component influence of different grade of diseases and the amount of worm, and studied the mixed damage of maize Ostriniafurnacalis （A）, Curvularia lunata （B）, Exserohilum turcicum （C）, Sphacelotheca reiliana （D） and economic threshold. The result showed that the main damage influence of diseases and worm was thick of ear, grains of row and the weight of one hundred grains, the grade of disease and the amount of worm had significant positive correlation to yield loss; the relationship of diseases and worm was complex, the yield loss of mixed damage was occupied 41.48% of the total damage of the single, the sequence was A〈C〈B〈D〈 ABCD〈（A＋B＋C＋D）, the simulated models of mixed damage and economic threshold were developed.
出处
《中国农学通报》
CSCD
2006年第6期297-300,共4页
Chinese Agricultural Science Bulletin
基金
"十五"国家科技攻关项目":玉米主要病虫害可持续控制技术研究"(2001BA509130401)。
关键词
玉米
丝黑穗病
弯孢叶斑病
玉米大斑病
玉米螟
复合经济阈值
Maize, Sphacelotheca reiliana, Curvularia lunata, Exserohilum turcicum, Ostrinia furnacalis, Mixed economic threshold
