تأثير بعض عناصر المكافحة الكيميائية والحيوية في الحدّ من إصابة البطاطا البطاطس بمرض اللفحة المبكرة المتسبب عن الفطر Alternaria solani وانعكاسها على النمو والإنتاجية

Abstract EN

This study was carried out at Alsonawbar Station of the Agricultural Scientific Research Center in Lattakia, Syria during the spring of 2021 to evaluate the effect of different treatments for the control of potato early blight disease, and their effect on plant growth and potato yield and quality.

Six treatments were evaluated: two chemical pesticides: Ranman 20% SC (cyazofamid), Moximate 50% WP (cymoxanil + mancozeb), three biological pesticides Bacillus subtilis, Beauveria bassiana and Trichoderma harizianum, in addition to the control.

Results showed that Ranman treatment was superior, as it led to reduction of 20.18 and 5.61 % in disease severity and infection rate, respectively, two weeks after treatment, with a decrease of 25.80 and 20.46 %, respectively, compared to the control.

With the same treatment, the leaf area and leaf area index reached 8438.75 cm²/plant and 3.45 m²/m², respectively, with an increase of 4827.75 cm²/plant, and 1.97 m²/m² over the control treatment.

Results also showed the superiority of Bacillus subtilis treatment in terms of tubers number, tubers weight, yield, and the proportion of marketable yield which reached 8.16 tuber/plant, 93.47 g/tuber, 3126.94 kg /donum, 95.30% marketable yield, respectively, which represented a reduction rate of 20.09%, 30.99%, 42.31%, 9.72%, respectively, over the control treatment.

In addition, results showed that the highest dry matter and starch content was obtained in response to the chemical pesticides treatments.