OCR Text |
Show DDT Formula To Check Lygus Hug Lygus bug control on first crop alfalfa which is being left for seed now is underway in several counties of Utah, reported Dr. Geo. F. Knowlton, USAC Extension entomologist. en-tomologist. The lygus bug population has been unusually heavy in many parts of Utah this spring. Serious seed yield reduction is anticipated anticipat-ed wherever this condition exists if lygus bug control is delayed until un-til late bud stage occurs. Already some "white bud" damage has been observed in untreated alfalfa fields in the Delta tract where most of the alfalfa now is in early to late bud stage of development. iDDT is the insecticide recommended recom-mended for lygus bug control in the bud stage. It should be applied ap-plied at the rate of 3 to 4 quarts of a 25 emulsion concentrate if a spray is used. This should con- , trol the lygus bugs for at least 3 weeks and destroy alfalfa weevil larvae present on the crop. Also, at the higher dosage suggested it should afford substantial help in retarding build-up of pea aphid populations. ' Seed growers planning to dust their fields should use 20 to 30 pounds of 10 DDT dust per acre, control lygus bugs for 3 weeks or more. However, 30 pounds may be used if farmers fear pea aphid build-up. However, to date pea aphid has not been particularly numerous in most Utah alfalfa fields examined during May, the Extension entomologist reported. |