THE LONG WINGED THRIPS (Scirtothrips longipennis Bagn.) AND ITS CONTROL IN GREENHOUSES hy 11.. \ndi son

In recent yea rs. g reenh ouse ()p e rat() r ~ oi \"ancu u I·er I s la nd hal·c s uffered hcal·y l\)"s e::; ca used by th e feeding of the adu lts a nd lan·ac o i t he Long \Vi ng:ed T hri ps (Scirtothrips longipennis Da g n.) o n gTee nh o use crops. Ei g ht d iffcrcnt spec ies o f p la n ts were fOl1nd to be attacked and () i thesc. begonia and cyclamen \I·c re th e mos t se l·er ely dan1:lge d. O\l · in g to it s 1I1inute s izc. t hi s thrip s rC lll a incd unn oti ced at lir,.; t an d th e injury. \I·hich c()ns istcd o f pec uliar. ru ~ ty- h rO\\"l l, corky serpentin e lines. had bee n attributed to o t her ca uses such a s nema-tode;;. fu ngi. e tc. It appea red that th e injury \I·a s n ll t being controlled hy the use o f nicot in e-soap and oth e r spraying m ea sures and th e da l11age continued to increase. Dur ing t he \I·in ter 111 0 n th s o f 19:35, the los,.;e;; becam e so exte ns il·e that the need of a th o rou g h in ves t igat ion \I·a,.; realized and studi es \\·e r e comlll enced in o rder te) dete rmin e t he nature and e xte nt of thc injury and ib cun tru1. Nature and Extent of Injur