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Tests were set up to compare the effectiveness of Lorsban 50 W applied at either petal fall, mid-July, or petal fall + mid-July. Treatments were arranged randomly in 3-row plots and were replicated three or four times in two locations. Lorsban 50 W (0.75 lb [AI]/100 gal ) was applied in a coarse spray with a handgun using a Rears Nifty-Pul-Tank sprayer operating at 150 psi. Spray was directed at burrknots and approximately 0.5 pt was applied per tree. Trees at the Wafler farm were mixed, consisting of ‘Empire’ or ‘Gingergold’ on ‘Mark’ rootstock, or Gingergold on M.9 rootstock. Trees at the Fowler farm were ‘Marshall McIntosh’ on M.9 rootstock. All these rootstocks expressed burrknots. Burrknots were examined for freshly produced frass (as an indication of infestation) in late June and in October. A tree was considered infested if any fresh frass was present, regardless of the number of burrknots per tree. Plots at the Fowler farm were small (20 trees long). Treatments were replicated four times. Ten trees in the middle row of each plot were examined for frass. At the Wafler farm, plots were three entire rows of a commercial orchard (» 600 ft long). Treatments were replicated three times. Fifty trees (June) or 25 trees (October) in the middle row of each plot were rated for frass. Proportion of trees infested per plot was recorded and transformed by arcsine squareroot for analysis using Fisher’s protected LSD test. In October, 10 infested trees were sampled for larvae in each plot at each location to determine the number and species present. At that time, APB were predominant at the Fowler orchard and DWB at the Wafler orchard, but both species were present at each location. Total numbers of larvae found in untreated checks was 10 APB, 2 DWB in Fowler orchard and 10 APB, 44 DWB, in Wafler orchard.

EVALUATION OF TRUNK SPRAY TIMINGS WITH CHLOPYRIFOS (LORSBAN) TO CONTROL BORERS INFESTING BURRKNOTS, 2000