EFICACIA DE DIVERSOS INSECTICIDAS EN EL COMBATE DE CUNCUNILLAS NEGRAS EN EMPASTADAS

Abstract

The effectiveness of several insecticides on the atack of blackworms was determined in Valdivia, Chile (Austral University, Punahue Experimental Station.)
A randomized block experimental design was chosen with 4 replications and 7 treatments. The insecticides were: Supracid, Gusathion, Thiodan, Diazinon, Valexon, Marlate and a non-treated control.
Under field conditions, the most effective products were Gusathion and Diazinon in controlling blackworms, the latter having a more rapid effect.
Marlate, Valexon, Thiedan and Supracid perfomed less effectively. The difference among larva counts although significantly lower than the control in comparison with the most effective response of Gusathion and Diazinon, were lower.
A high natural mortality rate during this study ranging 68,8% was detected.
Hepialid larva consumed the two main forage spieces of the pasture Holcus lanatus L. y Arrenatherum elatius var bulbosum (Wild) Spenner. The attack was mainly at soil level.