Horticultural Science & Technology (원예과학기술지)

Korean Society of Horticultural Science (한국원예학회)
권호 표지

Occurrence Pattern of Pests in Carrot Fields and Effect of Plant Debris Removal after Harvest at Highland Area

고랭지 당근밭의 병해충 발생 양상과 수확 후 잔재물 제거 효과

Kwon, Min;Ryu, Kyeong-Yeol;Kim, Jeom-Soon;Shin, Gwan-Yong
권민;류경열;김점순;신관용

  • Published : 2007.12.31
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Abstract

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.

Keywords

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