Eficiencia de control de "orugas defoliadoras" en soja (Glycine max L.), con insecticidas neurotóxicos y reguladores del crecimiento de los insectos
"Defoliating caterpillars" affect yields of soybean crops, especially in dry years of high temperatures which promote their development. The aim of this study was to assess the control efficiency of neurotoxic insecticides and IGRs on defoliating caterpillars in soybeans. Field exper...
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| Publicado en: | Revista de la Facultad de Ciencias Agrarias |
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| Autores principales: | , , , , |
| Materias: | |
| Acceso en línea: | https://bdigital.uncu.edu.ar/fichas.php?idobjeto=3917 |
| Sumario: | "Defoliating caterpillars" affect yields
of soybean crops, especially in dry years
of high temperatures which promote their
development. The aim of this study was to
assess the control efficiency of neurotoxic
insecticides and IGRs on defoliating caterpillars
in soybeans. Field experiments were carried
out in commercial plots in three locations in
the province of Cordoba in crop years 2008/09
and 2009/10 under a randomized block design
with six treatments and three replications.
The treatments were: T1: Chlorpyrifos
(384 g p.a.ha-1), T2: Cypermethrin (37.5 g p.a.ha-1)
T3: Lufenuron+Profenofos (15+150 g p.a.ha-1),
T4: Methoxyfenozide (28.8 g p.a.ha -1),
T5: Novaluron (10 g p.a .ha-1) and T6: untreated.
Plot size was twelve10-m long rows spaced
0.52 m apart. The application was made
with a backpack sprayer equipped with
hollow cone nozzles (40 drops.cm²) when
the pest reached the economic damage
threshold. In each plot, five samples were
taken 0, 2, 7 and 14 days after application
(DAA) using the vertical cloth, identifying
and quantifying live caterpillars larger
than 1.5 cm. Thirty leaflets were taken
per plot (middle and upper strata of the
plant) 14 DAA, and defoliation percentage
was determined using WinFolia Reg 2004
software. Yields were estimated on five
1-m² samples in each plot, and ANOVA
and Fisher’s LSD mean comparisons were
conducted. Chlorpyrifos had the highest
knock down effect and Methoxyfenozide the
greatest efficiency 7 DAA. Overall, IGRs
showed greater residual activity.
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