Efficiency of insecticides, applied as seed treatment and in plant pulverization in the control of green belly stink bug,
Dichelops melacanthus (Dallas) (Hemiptera: Pentatomidae), in corn crop
Crébio J. Ávila e Marcela M. Duarte
Abstract
The efficiency of the insecticide thiamethoxam applied as seed
treatment (210 g i.a./100 kg), the mixture thiamethoxam +
lambda-cyhalothrin (16.5+33 and 33+66 g i.a./ha) applied as plant
pulverization and the association of both treatments in the control of Dichelops melacanthus
adults on corn crop were evaluated. The experiment was carried out at
greenhouse and field conditions, with five chemical treatments and one
control treatment (without insecticide). The seed treatment was done
one day before field sowing. Ten days after the complete plant
emergence (in greenhouse and field) the pulverization was done with
thiamethoxam+lambda-cyhalothrin. Then, adults of green belly stink bug
were liberated to feed on corn plants, being used screen cages for
contention of the insects. The survival of adults of D. melacanthus was
significantly influenced by chemical treatments applied both on seeds
and in corn plant pulverization either at greenhouse or at field
conditions. At greenhouse conditions, it was observed better control of
adults when thiamethoxam was applied on corn seeds, independently if
the corn plants were sprayed or not with the mixture
thiamethoxam+lambda-cyhalothrin. However, at field conditions, the
mixture thiamethoxam+lambda-cyhalothrin sprayed on corn plant was more
efficient in the control of green belly stink bug than tiametoxam
applied on seeds.
Key
words
- Chemical
control, mortality, neotropical bug, thiamethoxam, lambda-cyhalothrin.
Resumo: Resumo
Texto Completo: PDF