ISHS Acta Horticulturae 713: VI International Peach Symposium
EVALUATION OF TWO AGRICULTURE DETERGENTS AS CONTROL ALTERNATIVES FOR GREEN PEACH APHID AND TWOSPOTTED SPIDERMITE, TWO PESTS AFFECTING PEACH ORCHARDS IN CHILE |
| Authors: | T. Curkovic, J. Araya, C. Canales, A. Medina |
| Keywords: | agricultural detergents, Myzus persicae, SU-120, TecsaFruta, Tetranychus urticae |
| Abstract:
Pesticide activity of the agricultural detergents SU-120 and TecsaŽ Fruta were evaluated on Tetranychus urticae (Koch) and Myzus persicae (Sulzer). Several concentrations of SU-120 were applied onto nymphs I and II, and adult M. persicae in Petri dishes in a Potter tower. For TecsaŽ Fruta, the aphids were submerged in a musseline cloth in the solutions. Mortality (no motility) was measured in both cases at 24 h. On T. urticae, mortality was evaluated on eggs and adult females adhered to a double sided scotch tape on glass slides, which were submerged 5 s in several concentrations, let to dry 15 min, and taken to 27°C and 70% RH. Mortality of females and eggs was evaluated at 24 and 144 h, respectively. Both detergents showed a direct relationship between concentration and mortality of the two species. SU-120 at 2.5% caused near 70% mortality on M. persicae adults and nymphs. TecsaŽ Fruta at ≥5% on adults obtained ≥85% mortality, and on nymphs, ≥2.5% solutions caused >70% mortality. SU-120 had a greater effect than TecsaŽ Fruta to control eggs and adult T. urticae females. Best control was obtained with both products on adult females, which required ~ 1.5-2.3x less detergent to reach the LC50. Detergents are an interesting alternative to control these polyphagous pests. | |
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