Firas Al-shehawy *⁽¹⁾, Mohammad Nahaal ⁽²⁾ and Basma Afram ⁽³⁾

• The Scientific Agricultural Research Center of Salamieh, General Commission for Scientific Agricultural Research, Damascus, Syria.
• Department of Plant Protection, Faculty of Agriculture, University of Aleppo, Aleppo, Syria.
• Directorate of Agriculture and Agrarian Reform, Hama, Ministry of Agriculture and Agrarian Reform, Damascus,

(*Corresponding author: Dr. Firas Asaad Alshehawy: Dr.fShehawy120@gmail.com).

Received: 29/06/2020        Accepted: 29/05/2020

Abstract

The potato tubers moth Phthorimaea operculella Zeller is one of the main pests of the potato crop, so the effect of alcohol extract for leaves of two plants Eucalyptus spp. and Thuja orientalis L. has been studied in the different phases of the potato moth in laboratory and field in north western of Aleppo governorate, Syria, in addition to studying the effect of mixing these two extracts in three concentrations with two insecticides (es-fenvalerate5%، emamectin benzoate5%) separately. Three laboratory experiments were performed to study the effect of these two extracts on the corrected death of the adult phase%, unhatchability of the eggs%, the repellence and attractive rate of the adult phase%, and a field trial to study the average% of repellence/plant. there were no significant differences between the two insecticides, as well as between the two studied potato varieties of Benilla and Spunta as a general mean of treatments for each experiment. laboratory results in the two seasons were showed superiority of the two pesticides and their mixing with Eucalyptus and Thuja leaves extracts in all treatments, follow that giving the treatment of Eucalyptus at concentration (10%) superiority in the corrected death of the adult%, and were observed superiority in Eucalyptus leaves extract (10%) and Thuja (10%) in unhatchability of eggs%, that is the increased efficacy of extracts against the moth by increasing their concentration. With giving the alcohol extract of Eucalyptus leaves (10%) in the two seasons the highest percentage of repellence, while the extract of Thuja leaves (10%) was the highest percentage of attraction. In field, all coefficients for mixing pesticides with extracts did not give superiority in their efficacy and positive effect against the moth, Eucalyptus leaves extract and its mixing with two insecticides made the best results, and the concentration 10% of Eucalyptus extract without mixing was the best in field. Consequently, thus the concentration 10% of Eucalyptus extract can be used in potato tuber moth control programs.

Keywords: alcohol extract for leaves of Eucalyptus spp. and Thuja orientalis L., Tow insecticides, Potato Tuber Moth, Syria.

Full paper in Arabic: PDF