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Image 4 of Kentucky fruit notes, vol. 4, No. 1, January 1949

Part of Kentucky Agricultural Experiment Station

4 ( r.e~y*2x2ix rwssyik Injugy. Crop reduced by cutting off of bloom buds (Fig. l), blooms and green berries. Life history The adult (Fig 2.) is a tiny brown or blackish weevil with a long bea_k_which deposits its eggs in the unopened blooms and then girdles or cuts the buds so that they die or fall to the ground (Fig 1). Usually a single egg is laid in each bud. The egg soon hatches into a whitish legless grub which eats the contents cf the unopened bud, pupates, and then emerges as an adult weevil. New adults feed for a short time and then go into hibernation in fence rows or woods. In Kentucky adult weevils appear in strawberry patches in late March or early April and begin cutting buds about the tirrie the first blossouns open. Beetles are most active on warm sunny days, They also attack the buds of wild black berries. Cpntigolg In patches where weevil was bad last year make treatrnent as soon as first blossoms open. ln other patches treat as soon as first cut buds are noticed. For years cryolite has been the standard insecticide for the control of I strawberry weevil. This material has given good results in Missouri, Tennessee, Canada, and several other berryproducing areas. Cryolite is usually used as a dust diluted with Z parts of talc or dusting sulfur to one part of cryolite. From _ 30 to 50 pounds are needed to treat an acre. Some of the new organic insecticides will undoubtedly replace cryolite for weevil control in the near future. Evidence on the value of DDT dusts is conflicting. Canadian workers report good control with 3% DDT dust. However, . in tests which W. D. Armstrong and the writer made in Marshall county, Kentucky, - in 1948, 5% DDT dust gave no control at all, Canadian workers also report good results with DDT spray. This is confirmed by Mr. G. E1. Marshall of the Purdue Agricultural Experiment Station who got good control of weevil last year in a berry patch near Bowling Green, Kentucky, which he sprayed with 2 pounds of 50% wettable DDT per 100 gallons. In a test which we ran near Sharpe, Kentucky, last season, excellent weevil control was secured with one application of a 5% chlordan dust. We plan to continue experimental. work on the control of strawberry weevil in 1949. Iereieeepley we lnjuryr Fruits often fail to develop to normal size and have a hard, seedy tip (often called "button" berries) (Fig. 3). I;.iQe_ ljjjtory. The insect responsible for this type of damage is a small, brownish plant bug (Fig. 4) which breeds on weeds in and near berry patches, The