The research progress on pests and insecticide activity of Annona squamosa L. is summarized in the paper,including symptom,occurrence regularity and control met
[Objective] The paper was to study the disease grading criterion and assess the yield loss caused by maize rough dwarf disease. [Method] The ear lengths and yie
[Objective] The paper was to explore the relationship between character of rice stem and compressive strength. [Method] The morphological and anatomical charact