Year:2022   Volume: 4   Issue: 3   Area:

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Qais K ZEWAIN

FIRST RECORD FOR WATERMELON NECROSIS DISEASE ON WATERMELON CROP İN IRAQ

This research was carried out during a severe unknown disorder epidemic wave was spread out on ‎watermelon crop over all Iraqi provinces that causing significant economic losses to the farmers of this ‎crop. The research included conducting a field survey covering about 183 hectares of watermelon ‎fields during the spring agricultural season in four Iraqi provinces; Baghdad, Kirkuk, Erbil, and ‎Penguin/Sulaymaniyah. According to this survey, the disease occurrence percentage ranged from 70-‎‎100% in Baghdad, Kirkuk, and Erbil, while it was around 10-20% only in the Penguin/Sulaymaniyah ‎area. It is also noted that plants growing under the shade of trees or long intercropped crops like ‎sunflower, were escaped from the infection. Despite many watermelon varieties cultivated by farmers ‎during the survey year, no resistant or tolerant varieties were observed, and minor differences in their ‎susceptibility were noticed. The disease is diagnosed as Watermelon rind necrosis (WRN) depending on ‎intensive field and laboratory investigations‏ ‏conducted for this purpose. Bacteria were isolated from ‎necrosis spots in the watermelon rind, but the same was isolated also from the healthy tissues in the ‎watermelon rind with less intensity. A high correlation was found between disease occurrence and the ‎amount of difference between night and day temperature during the first month before the fruit ‎ripening. This research finding is considered the first record of watermelon rind necrosis (WRN) disease ‎on the watermelon crop in Iraq‎.

Keywords: Watermelon, Watermelon Rind Necrosis Disease, WRN.

http://dx.doi.org/10.47832/2717-8234.12.27


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