Resumen

PINO, Cesar; SILVA, Gonzalo; HEPP, Ruperto  y  VENEGAS, Fernando. Efficacy of Peak Plus® against Caliroa cerasi (Hymenoptera: Tenthredinidae). Cienc. Inv. Agr. [online]. 2007, vol.34, n.1, pp.23-29. ISSN 0718-1620.  http://dx.doi.org/10.4067/S0718-16202007000100003.

The pear slug (Caliroa cerasi L.) is an important pest of sweet cherries in Chile. It attacks during the harvest and can only be controlled by organosynthetic insecticides. The objective of this study was to evaluate the effect of fatty acids (Peak Plus®) of low risk of toxicity on mammals. The mortality and median lethal concentration (LC₅₀) of Peak Plus® against C. cerasi was determined under laboratory conditions using ten larvae fed on leaf disks in Petri dishes. The insecticide efficacy and foliar damage were evaluated under field conditions on sweet cherry cv. Bing. Treatments were arranged as randomized complete block design with six treatments replicated four times. The LC₅₀ obtained was 1.14 g-L¹ and LC₉₀ was 2.7 g-L¹ 24 h after treatments. In the field, Peak Plus® at a concentration of 10 g-L¹ showed high efficacy against C. cerasi, similar to the effects obtained with fenvalerate and methidathion. Peak Plus® at the highest rate decreased foliar damage in a similar way to other insecticides currently used. Finally, we concluded that Peak Plus® is an efficient alternative to organosynthetic insecticides in the control of C. cerasi of sweet cherry

Palabras clave : Fatty acid; pear sawfly; defoliation; pests; sweet cherry.

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