Investigation on the Efficacy of some Fungicides in Controlling Alternaria Late Blight of Pistachio
الموضوعات :
Hossein Khabbaz-Jolfaee
1
,
Mehdi Mohammadi-Moghadam
2
,
Gholamreza Baradaran
3
,
Mojtaba Ghalandar
4
1 - Department of Plant Pathology, Iranian Research Institute of Plant Protection, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran
2 - Crop and Horticultural Sciences Research Department, Agricultural and Natural Resources Research and Education Center of Semnan Province (Shahrood), AREEO, Shahrood, Iran
3 - Department of Plant Protection, Kerman Agricultural and Natural Resources Research and Education Center, AREEO, Kerman, Iran
4 - Department of Plant Protection, Markazi Agricultural and Natural Resources Research and Education Center, AREEO, Araak, Iran
الکلمات المفتاحية: Pistachio, fungicides, Alternaria Late Blight, Pyradim,
ملخص المقالة :
The efficacy of Pyradim ® DF with pyraclostrobin+dimetomorf active ingredient was evaluated in comparison with fungicides Captan, Nordox, Mishocap in the control of pistachio Alternaria late blight. The experiment was carried out in Markazi (Zarandieh), Kerman and Semnan in a Randomized Complete Block Design (RCBD) with 8 treatments and 4 replications. Treatments were applied at two stages (before bud swelling and after the petals fall and fruit set). The data were analyzed using SAS software and mean comparison of disease severity and disease incidence percentages were done by Duncan's multiple range test (P =5%). The results showed that Pyradim with dosage of 1 and 0.75 per thousand has a good efficacy in disease control. So that the efficiency of dosage 1g L-1 in reducing the severity of the disease compared to the control without spraying was about 88% in Zarandieh and about 77% in Kerman and Semnan. The efficacy of Pyradim at the dose of 0.75g L-1 in Zarandieh, Kerman and Semnan was about 76%, 72% and 74%, respectively, but the dose of 0.5g L-1 Pyradim was not acceptable and in the three studied areas was between 52 to 55%. Captan fungicide also had acceptable efficacy in controlling pistachio Alternaria late blight disease, so that its efficiency was more than 70% in Kerman and Semnan and 68% in Zarandieh. In contrast, Nordox and Mishocap fungicides did not have good efficiency. Therefore, 0.75g L-1 pyradim is recommended for controlling pistachio Alternaria late blight disease.
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