Inheritance of Resistance to Powdery Mildew in Two Cucumber Varieties;

The inheritance of resistance to methamidophos in brown planthopper, Nilaparvata lugens Stal;

The inheritance of resistance to buprofezin in the brown planthopper, Nilaparvata lugens (Stl),was studied through assaying dose-response data of the third nymphs of resistant (R) and susceptible (S) parents, reciprocal crosses (F-(1) and F~′-(1)), self-bred (F-(2) and F~′-(2)) and backcross (BC) progenies to .

It might be referred on resistance inheritance research, resistance management and fungicide control.

Adopting conventional hybrid approach,the important wheat cultivar Zhongliang 22 in the Southern Gansu of China as the female parent was hybridized with the susceptive cultivar Mingxian 169 as the male parent,so as to study the resistance inheritance of wheat cultivar Zhongliang 22 in seedling plants inoculated with the strains of stripe rust(Puccinia striiformis West.

Research progress of damage, causal organism, measuring criterion, disease resistance evaluation and resistance genetics have been summarized systematically.

Genetic Resistance of Spotted-brown, Redbro Chicken & Their Reciprocal Hybrids to Colibacilloisis and Newcastle Disease;

The present situation and advance of the study on poplar resistance in recent decades were summarized in the aspects of genetic resistance and ecological resistance.

In order to provide basis for extending maize disease resistant varieties, the experiments of the resistance of the hybrids and inbred lines and their resistant inheritance of F1 were conducted during 1997 - 1998.