The Physical Control of Bradysia agrestis by Using Sticky Trap and Substrate Cover in Greenhouse-grown Squash

Abstract

This study has been made in order to examine the physical control effect against fungus gnat ( Bradysia agrestis Sasakawa; Diptera: Sciaridae) by using a yellow sticky trap and material with which substrate was covered in hydroponic squash in Gwangyang, Jeonnam from March to October 2014. With regard to the control method, the substrate was covered with a black and white film, and a part in which a seedling would be planted was cut out. And if a customized yellow sticky trap was inserted so that the substrate in the cut-out part was not exposed after planting the seedling, the invasion of an adult could be prevented, and no larva appeared in the substrate for the whole growing period. It took 8 hours per 10a to cover the substrate and to install the yellow stick trap. On the other hand, in case of not being covered, it took 88 hours to make an effort at chemical control for the growing period. In case of being covered with black and white film, the number of fruits per plant was larger by 7 in comparison with not being covered. The temperature inside rhizosphere was lower by approximately 1 (cid:59282) , and diurnal variation was small. Thus, the temperature was stable. It was possible to apply this method if mulching was performed at the same time in growing in soil as well as hydroponic crops such as paprika, cucumber, and strawberry.