INSECT, PLANT DISEASE, & WEED SCIENCE NEWS [No. 88-9] [May 20, 1988]

In This Issue: Postemergence Shattercane Control in Corn Postemergence Heed Control in Onions Leafy Spurge Reminder Grass Control in Ornamentals Postemergence Shattercane Control in Corn Postemergence control of shattercane in corn is limited. Bladex 80W or 90DF used with vegetable oil or a surfactant can be used before corn exceeds the 4-leaf stage. The Bladex label does not claim shattercane control. Our observations are this treatment stunts small shattercane plants but may not kill them. Similar results may be obtained with 2 qt./A atrazine used with crop oil concentrate. Tandem used with Bladex or atrazine will improve activity somewhat. Similarly, Prowl used with Bladex or atrazine before the 5-leaf stage of corn improves activity compared to the triazine alone. While these treatments don\u27t kill the shattercane they set it back allowing the corn to get ahead of the cane. This sets the stage for effective control with cultivation. Postemergence Weed Control in Onions Fusilade 2000 is now fully registered for use in dry bulb onions for the control of grassy weeds. Recommended rates are from 12 to 32 oz. per acre and should be applied with a nonionic surfactant or crop oil concentrate. 00 not apply more than 96 oz. per acre per year. 00 not harvest within 45 days after application. Leafy Spurge Reminder Leafy spurge is very obvious now in grazing land and along roadsides. The plant is easily seen as the tops of the plants are bright yellow. Small patches should be treated before they spread. The ideal time to treat leafy spurge is from mid-May to early June. Grass Control in Ornamentals Perennial grasses such as bromegrass, bluegrass, and quackgrass often become troublesome weeds in iris, peonies, other, herbaceous plantings, and woody ornamentals. Likewise, annual grasses including crabgrass, foxtails, barnyardgrass, and annual bromes present somewhat similar problems. There is an answer