EFFECTS OF SELECTED FOLIAR APPLIED INSECTICIDES ON THRIPS INJURY AND YIELD OF VIRGINIA-TYPE PEANUT, 1998

EFFECTS OF SELECTED FOLIAR APPLIED INSECTICIDES ON THRIPS INJURY AND YIELD OF VIRGINIA-TYPE PEANUT, 1998: Selected foliar applied insecticides were evaluated against TT injury and for effects on plant growth and yield of Virginia-type peanut. 'VA-C 92R' peanut was planted 6 May at the Virginia Tech Tidewater Agric. Res. & Ext. Ctr., Suffolk, VA using 36-inch row spacing. Eight gpa of metam-sodium 42% were injected into rows as a soil fumigant on 24 Apr, about 2 wks before planting. Foliar sprays were applied on 28 May, after plants had emerged, and again 11 Jun. Sprays were applied in a 12 to 14-inch band (FB) over the row with a CO2-pressurized backpack sprayer calibrated to deliver 17.0 gpa at 22 psi through one 8003E flat fan nozzle over the top of each row. A RCB design was used with four replicates. Plots were 4 rows x 40 ft. TT injury was evaluated on a 0 to 10 scale where, 0 = no thrips induced plant injury, 1 = 10% injured leaves, 2 = 20% injured leaves, 3 = 30% injured leaves, 4 = 40% injured leaves, 5 = >= 50% injured leaves + £ 5% terminal buds injured, 6 = >= 50% injured leaves + 25% terminal buds injured, 7 = >= 50% injured leaves + 50% terminal buds injured, 8 = >= 50% injured leaves + 75% terminal buds injured, 9 = >= 50% injured leaves + >= 90% terminal buds injured, and 10 = dead plants. Lateral plant branch width was measured on 26 Jun, 51 days after planting, from 4 randomly selected plants per plot. Yield was determined by digging, drying and combining peanuts from the 2 center rows of each plot. Data were analyzed using ANOVA and LSD procedures.