ABSTRACT
Bollworm (BW) and tobacco budworm (TBW) control with Tracer 4SC (0.067 lb AI/acre) or Steward 1.25SC (0.11 lb AI/acre) was compared
between ground (6 GPA) and aerial (3 GPA) application methods. Four
applications were applied during late Jul to early Aug on Phytogen 355
cotton. Both Tracer and Steward reduced the number of BW/TBW injured
and larval infested fruiting forms and increased seedcotton yield compared
to the non-treated plots. Treatments applied by ground were more effective
in controlling BW and TBW compared to those applied aerially. In a
second experiment, the ovi-larvicidal efficacy of selected insecticides was
evaluated against native BW and TBW infestations. Ovi-larvicidal toxicity
ranged from 12.5% (Provado 1.6SC, 0.0375 lb AI/acre) to 77.5% (Steward 1.25SC, 0.11 lb AI/acre). The highest levels of mortality to eggs and larvae
were measured for Tracer 4SC (70%) (0.067 lb AI/acre), Denim 0.16 EC
(75%) (0.01 lb AI/acre), and Steward 1.25SC (77.5%) (0.11 lb AI/acre).
|