Sweet Potato Ditylenchus Destructor Epidemic in Shangluo and Its Preventive Measures
Sweet potato ditylenchus destructor epidemic has been identified for the first time in three farm-land areas in Shangluo,with infection rate of 5.80%,5.93%and 4.98%,along with disease index of 2.72,3.28 and 2.74,respectively.Laboratory morphological observation and PCR detection of rDNA-ITS region of pathogenic nematode further confirmed the presence of sweet potato ditylenchus destructor.Cross-regional pur-chase of susceptible crop seeds and seedlings,particularly the use of sweet potato seeds containing pathogenic nematodes,were identified as the main reasons for the epidemic in Shangluo.To address this issue,preventive measures are proposed,including raising awareness and adjusting stubble in production,selecting varieties resist-ant to ditylenchus destructor,promoting high-cutting seedling technology,strengthening quarantine measures,and prohibiting the purchase of seedlings from epidemic areas.Active use of nematicidal pesticides in production is also recommended to curb the spread of the sweet potato Ditylenchus destructor epidemic in Shangluo.
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