Evaluation of Chlorfenpyr for Dbm Control on Head Cabbage, 1996

Abstract

Abstract The insecticides were evaluated at the Kula Research Station, Maui Agricultural Park, from April to May. The field was set up in a CRB design with eight treatments and four replications (blocks). Treatments were applied using a CO2 backpack sprayer set at 60 psi with an output of 100 GPA. One hollow cone nozzle (TX-26) was used per row. The first treatment was applied one week after transplanting into the field on 9 Apr. Subsequently, six applications were made weekly until the week before harvest on the following dates: 16, 23, 30 Apr, 7, 14, 21 May. The treated check treatment consisted of Bacillus thuringienis aizawai (BTA) or Proclaim applied using the University of Hawaii DBM resistance management protocol. BTA products are used prior to the cupping stage of growth. Proclaim 0.15 EC @ 6.0 oz./A is applied if DBM densities exceed 1.0 larva per plant. Proclaim is used after cupping if DBM densities exceed 0.5 larva/plant and 1-2 applications are made during the two weeks prior to harvest if DBM is present. Larval thresholds were determined by making larval counts on 10 plants/treatment replication. Mattch at 2.0 qt./acre was the BTA product used and it was applied on 16 and 23 Apr. Proclaim was applied on 30 Apr, 7 and 14 May.