Effects of planting distances and Bacillus thuringiensis Berliner on Alabama argillacea (Hübner), Aphis gossypii Glover and natural enemies of cotton

  • Sergio Antonio De Bortoli FCAV-Unesp, Jaboticabal, SP.
  • Alessandra Marieli Vacari FCAV-Unesp, Jaboticabal, SP.
  • Maurício do Carmo Fernandes FCAV-Unesp, Jaboticabal, SP.
  • Caroline Placidi De Bortoli FCAV-Unesp, Jaboticabal, SP
  • Sergio Leandro Placidi De Bortoli FCAV-Unesp, Jaboticabal, SP.
  • Dagmara Gomes Ramalho FCAV-Unesp, Jaboticabal, SP
Keywords: cotton leafworm, cotton aphid, cropping system, Dipel®, entomopathogenic bacterium, pathogenicity

Abstract

Some insects are important pests in cotton crops and can cause serious yield losses. Among them we can relate Alabama argillacea (cotton leafworm) and Aphis gossypii (cotton aphid), demanding, often, the use of control measures. This study aimed to evaluate the toxicity of Bacillus thuringiensis (Dipel®) to cotton leafworm and analyze its effect on the occurrence of this pest and the cotton aphid in cotton grown under two system of row spacing, in two places in the State of Mato Grosso, Brazil, as well as in some natural enemies. The toxicity was evaluated using doses of 0.30, 0.50, 0.75 and 1.00 L/ha, considering large cotton leafworm larvae (>1.5 cm) and small ones (<1.5 cm) in a laboratory bioassay. The effect of the biopesticide on A.argillacea and A. gossypii was compared in cotton grown in row spacing of 0.90m (conventional) and 0.45m (reduced). The results indicate that: Dipel® has good efficiency for control A. argillacea caterplillars and is selective for A. gossypii, causing a significant increase in cotton yield; 0.45m row spacing promotes a decrease in density of larvae of A. argillacea and A.gossypii, and yield is similar in both spacing, 0.90 and 0.45m, and bigger in treated areas.

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Published
08-07-2015
How to Cite
De Bortoli, S., Vacari, A., Fernandes, M., De Bortoli, C., De Bortoli, S. L., & Ramalho, D. (2015). Effects of planting distances and Bacillus thuringiensis Berliner on Alabama argillacea (Hübner), Aphis gossypii Glover and natural enemies of cotton. Comunicata Scientiae, 6(2), 202-211. https://doi.org/10.14295/cs.v6i2.156
Section
Original Article