| In this thesis, diseases infecting Amorphophallus rivieri in some mountainous areas of Hubei province were surveyed and the efficacy of some measures to control erwinia rot of this crop was evaluated. Results showed that a total of 12 infectious diseases, including erwinia soft rot, fusarium wilt, sclerotium root rot, bacterial leaf blight, virus diseases, ring spot, anthracnose, nematode, rosellinia trunk rot, purple rot and leaf scorch, were identified. Among these diseases, erwinia soft rot, sclertium root rot, fusarium wilt and root rot were more severe than other diseases. Disinfection tubers of A. rivieri with the fungicides chlorothalonil and streptomycin before sowing could effectively prevent infection of A. rivieri plants. Amendment of soil with 20% lime powder on harvested tubers of A. rivieri showed a significant reduction of rot disease during the storage period. Results of the field trials indicated that intercropping A. rivieri with corn resulted in a significant increase of tuber yield of A. rivieri and a decrease of disease severity. Spraying of thulium preparations on plant canopies of A. rivieri improved disease resistance of this ccrop. Coating seed tubers with the fungicides including Ketone streptomycin and fenaminosulf before sowing reduced disease incidence from 26.3% in the control treatment to 6.9% and the disease index from 22.1 in the control treatment to 5.0 in the fungicide treatment, thereby enhancing the tuber yield of this crop. Meanwhile, results of field experiments showed that oxadixyl and antibiotic 120 are the two most effective fungicides to control erwinia soft rot, wheras the fungicide mancozed was effective in controlling S. rolfsii, and Green Hang No. 2 was effective in controlling root rot. This study suggests that extension of these measures can be extended to hands of farmers to control diseases of A. rivieri.
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