Organic plant protection measures against olive moth (Prays oleae Bern.)
2018
Dminić Rojnić, I. | Radovčić, H. | Godena, S. | Damijanić, K.
Olive moth (Prays oleae Bern.) is a periodical pest of the olive tree (Olea europaea). It is one of the most economically important olive pests which in some years can cause up to 80% loss of yield. The aim of this survey was to investigate the efficacy of applying biological plant protection measures in order to reduce pesticide residue contained in olive fruits. The experiment was set up in 2014 in Vrsar, Croatia. An olive grove was planted with domestic olive cultivar 'Istarska bjelica' and two organic treatments were set up, one using azadirachtin and the other using Bacillus thuringiensis var. kurstaki pesticides. Flight of olive moth, development stages of anthophagous and carpophagous generations and damage were monitored weekly. Olive moth flight was monitored using pheromone traps, while damage was monitored by collecting fallen fruits. After the first capture of adults on pheromone traps, we started looking into the development stages and the damage of olive moth. The peak in adults captured on the pheromone trap of anthophagous and carpophagous generations and the development of eggs in each generation determined the treatment time. Comparison between each treatment was carried out and the outcome was as follows: the average number of captured olive moths, developing stages of olive moth and damage varied between treatments. Azadirachtin and B. thuringiensis var. kurstaki showed good efficacy in suppression of the anthophagous generation, while azadirachtin treatment was more effective in the decrease of captured adults and damage of the carpophagous generation than B. thuringiensis var. kurstaki.
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