Abstract:

In this paper, the taxonomic status of the asparagus stem blight fungus and its cultural characteristics on potato dextrose agar medium plates were introduced. The color and morphology of sporulation apparatus, such as stroma and pycnidium, were described. Shapes and sizes of the two types of conidia from pathogenic fungi were summarized. The symptoms of asparagus stem blight in field, the occurrence conditions of chronic and acute lesion and the key points of identification were introduced in detail. The occurrence of asparagus stem blight was elaborated from the following aspects, i.e. initial infection source after overwintering, release and germination of overwintering conidia, infection period of the disease and epidemic law of the disease. In this paper, the agricultural control measures on asparagus stem blight were summarized from the aspects of removing the diseased stems from the root disks, delaying the retention of the mother stems in spring, and covering the root disks with sand. The main biological control measures of asparagus stem blight were summarized from the aspects of chitosan-induced resistance to stem blight and biocontrol bacteria to stem blight of asparagus. The progress in chemical control of asparagus stem blight was reviewed from the aspects of fungicide inhibition, fungicide resistance, fungicide control effect and pesticide screening. It was suggested that the control of asparagus stem blight should be based on the agricultural control measures aiming at reducing the source of pathogenic fungi and cutting off the route of transmission, and the integrated control mode should be mainly based on biological control and supplemented by chemical control, to meet people's demand for green food.

Key words: asparagus stem blight, Phomopsis asparagi, disease symptom, disease occurrence regularity, comprehensive prevention and control