EFFECT OF INSECT SCREEN SURROUNDING THE HYDROPONIC BENCH ON THE MICRO-CLIMATE, INSECT OCCURRENCE RATE, AND YIELD OF 19 WRAP-UP VEGETABLES IN SUMMER SEASON
Wrap-up vegetables make an important contribution to the Korean dietary life as mineral and fiber sources. The pesticide-free produces have become popular in Korea. Physical control methods in plant protection have been thought as a substitute for synthetic insecticides in pest management. Nineteen wrap-up vegetables (8 Brassicaceae, 9 Compositae and 2 Chenopodiaceae) were planted on small DFT hydroponic units under glasshouse conditions during the summer season. Four treatments: 1) sidewall screen, 2) sidewall + bench screen, 3) bench screen and 4) no screen (control) were established. Bench screen means that an insect screen (weaving type, with a holes size of 1,440 μm × 690 μm) was set around the hydroponic bench to protect the plant against the insects. GI-pipe bench (7.5 × 1.2 × 0.75 m) with 20 L of capacity was set to stand the small hydroponic units. Photosynthetic active radiation (PAR) was reduced by 18±10.6% by the insect screen. Air temperature inside the screen in the treatment of sidewall + bench screen was higher by 0.53±0.53°C and relative humidity was lower by 0.78±0.44% than sidewall screen only. There is no significance in % of insect occurrence rate with the sidewall insect screen but significant with bench screen. The % of insect occurrence rate calculated as % of the number of plant injured by any insect divided by 4 plants was decreased by 66.7-100% in bench screen treatment. As the results, the mean accumulated yield of 19 wrap-up vegetables was increased by 13% with the treatment of bench screen by alleviating the insect damage. These results suggest that insect screen equipped around the hydroponic bench is able to be practically used in hydroponic field producing pesticide-free wrap-up vegetables.
Seo, T.C., Roh, M.Y., Choi, K.Y., Kang, N.J., Choi, Y.H., Rhee, H.C., Um, Y.C. and Lee, S.C. (2009). EFFECT OF INSECT SCREEN SURROUNDING THE HYDROPONIC BENCH ON THE MICRO-CLIMATE, INSECT OCCURRENCE RATE, AND YIELD OF 19 WRAP-UP VEGETABLES IN SUMMER SEASON. Acta Hortic. 843, 261-268
DFT system, "Ssam" vegetables, damage, physical protection, PAR, Brassicaceae, Compositae, Cheonopodiaceae