Efficacy of abamectin, thiamethoxam and amitraz in controlling European pear sucker (Cacopsylla pyri L.) in pear orchards

Abstract

The efficacy of abamectin, thiametoxam and amitraz in controlling of pear sucker (C. pyri) in pear orchards was investigated on the locality of Bela Crkva during 2004 and 2005. Experiments were conducted at different pest and plant development stages and for this reason the intensity of infestation varied. Sprays were applied in the late flowering stage in 2004 and some-what later, with the hatching of larvae, in 2005. Abamectin was highly effective in controlling all C. pyri larvae instars (97.8-99.8%). The efficacy of thiametoxam in controlling the initial development stages was high (98.4-99.7%) but low in controlling the final development instars (74.2-78.5%). The efficacy of amitraz in controlling of all larvae instars of pear sucker was lower (84.4-86.0%) then the expected. Further research is needed to assess the resistance level of pear sucker populations to amitraz in our country.

Tokom 2004. i 2005. godine ispitivana je efikasnost abamektina, tiametoksama i amitraza u suzbijanju obične kruškine buve (Cacopsylla pyri) u zasadu kruške, na lokalitetu Bela Crkva. Ispitivanja su obavljena u različitim momentima razvoja štetne vrste i gajene biljke, tako da se i intenzitet infestacije razlikovao. Tretiranje u 2004. godini obavljeno je u fazi precvetavanja, dok je u 2005. godini tretiranje izvedeno nešto kasnije, pri masovnijoj pojavi larvi. Najveću efikasnost ispoljio je abamektin u suzbijanju svih stupnjeva larvi C pyri (97.8-99.8%). Visoku efikasnost (98.4-99.7%) u suzbijanju mlađih i slabiju efikasnost (74.2-78.5%) u suzbijanju starijih razvojnih stupnjeva ispoljio je tiametoksam. Stepen efikasnosti amitraza je bio slabiji od očekivanog u suzbijanju svih stupnjeva larvi (84.4-86.0%). Ova istraživanja ukazuju na potrebu ispitivanja stepena razvoja rezistentnosti populacija obične kruškine buve na amitraz u našim proizvodnim područjima.