초록

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Abstract ▼ AI-Helper

To investigate the effect of soil-dressing in carrot field on pests occurrence, totally 50 fields cultivating carrot were chosen within Pyeongchang area, where highland adoptable carrots were cultivated every year. Also, occurrence degree of pests was surveyed by species and by times for 5 carrot fi...

To investigate the effect of soil-dressing in carrot field on pests occurrence, totally 50 fields cultivating carrot were chosen within Pyeongchang area, where highland adoptable carrots were cultivated every year. Also, occurrence degree of pests was surveyed by species and by times for 5 carrot fields including one pesticide-free field. In addition, relationship between phytophagous nematode density and soil physico-chemical components (soil pH, EC, content of NH4-N, NO3-N, organic matter, P, Ca, Mg and K) was analyzed. Occurrence pattern of carrot pests at highland region was slightly different from that at plain area. Among eight diseases surveyed, alternaria leaf blight (Alternaria dauci) was most serious, if not controled, infection degree could reach more than 70%. The appropriate fungicide-spraying period for the control of this disease would be mid July the most in the field. Density of phytophagous nematode and yearly soil-dressing intervals did not represent a significant correlation. Furthermore, no significant correlation between nematode density and soil physico-chemical components was confirmed. The effect of field sanitation on pests occurrence next year was not certain in this study. Both debris-left plot and debris-cleared plot showed a similar occurrence degree of pests, e.g. 50~60% on average for alternaria leaf blight. Therefore, it is necessary that removal of plant debris from the fields after harvest should be re-examined deeply in reference to soil erosion protection not pests occurrence.

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