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growers were instructed to spray at 14-day intervals, starting control of powdery mildew on field-grown mango trees by mono-potas-
from 5 cm panicles, or after rain events. The present study sium phosphates, sterol inhibitor fungicides and the strobilurin Keroxim-
shows that fungicides applied from 5 or 10 cm panicles at 10- methyl. European Journal of Plant Pathology 104: 853-860.
day intervals improved disease control, compared to 14-day 9. Reuveni M. (2000): Efficacy of trifloxystrobin (Flint), a new strobilurin fungi-
intervals. Earlier applications did not improve disease control. cide, in controlling powdery mildews on apple, mango and nectarine, and
However, later application started at first open flower stage rust on prune trees. Crop Protection 19: 335-341.
were less effective. Foliar sprays applied before rain events
provided better disease control, compared with trees sprayed Powdery mildew in Mango:
after the rain. About 30 fungicides are registered against Etiology and development of improved
mango powdery mildew in Israel. No comparable trials for disease control management
fungicides efficacy have been conducted in the recent years.
Our efficacy trials showed that tetraconazole, meptyldinocap, L. Gur, K. Levy, M. Reuveni (mreuveni@research.haifa.ac.il) / Golan Re-
penconazole, mineral oil and a tank-mix of systemic fungicide search Institute, University of Haifa
with sulfur were very effective and provided 70-90% protec- A. Farber / Kiryat Shmona
tion, compared to control non-treated trees. QoI (strobilurins) M. Noy, C. Lahav / Extension service, Ministry of agriculture
fungicides efficacy was less consistent. In case of existed
infection on trees, two consecutive applications of sulfur or Powdery mildew caused by Pseudoidium anacardii (former Oidium mangif-
mineral oil combined with systemic fungicides inhibited dis- erae Berthet), attacks panicles, young fruits and leaves and may cause a
ease development. The main findings in this work have been considerable crop loss in mango trees. Mango is the only known host of the
implemented by the growers and being used to develop an pathogen. Rain events during flowering encourage disease. Disease control
management in Israel has not been extensively investigated recently, and
improved diseases control management. 0
2015 מרץ, ‘עלון הנוטע’ שנה ס”ט36 ‘Alon Hanotea’ vol. 69 March 2015
