Articles
UVC treatment effective against powdery mildew in zucchini
Article number
1378_29
Pages
219 – 226
Language
English
Abstract
In two trials in open air zucchini, a UV treatment against powdery mildew was evaluated.
For this, UV lamps were mounted on a self-propelled spraying tractor.
The UV apparatus consisted of four light armatures containing a UVC lamp (type Philips TUV PL-L 95W). An electrical power unit (petrol powered) with AC output provided power.
Side screens protected bystanders against direct radiation and a remote control (Niko RF system) was installed to switch on the lamps from within the tractor cabin.
In the first trial the concept was evaluated.
Subsequently, the second trial was designed as a randomized complete block trial to study the effectivity against powdery mildew.
On July 19, the cultivar Milos was planted.
Net plot size was seven plants and sufficient discard area was maintained between experimental plots.
UV treatments were performed after sundown every three days from August 17 to September 24. The trial comprised six treatments: untreated, high dose (3x), medium dose (1.5x), low dose (x), mixed organic and a chemical reference (with x=72 J m‑2 from August 17 to September 9 and x=216 J m‑2 from September 10 to 24). UV treatment at high and medium dose showed a clear efficacy in comparison with the untreated (respectively, 63 and 37% on September 29, upper side of leaves) in the trial and had no apparent adverse effect on the crop.
For this, UV lamps were mounted on a self-propelled spraying tractor.
The UV apparatus consisted of four light armatures containing a UVC lamp (type Philips TUV PL-L 95W). An electrical power unit (petrol powered) with AC output provided power.
Side screens protected bystanders against direct radiation and a remote control (Niko RF system) was installed to switch on the lamps from within the tractor cabin.
In the first trial the concept was evaluated.
Subsequently, the second trial was designed as a randomized complete block trial to study the effectivity against powdery mildew.
On July 19, the cultivar Milos was planted.
Net plot size was seven plants and sufficient discard area was maintained between experimental plots.
UV treatments were performed after sundown every three days from August 17 to September 24. The trial comprised six treatments: untreated, high dose (3x), medium dose (1.5x), low dose (x), mixed organic and a chemical reference (with x=72 J m‑2 from August 17 to September 9 and x=216 J m‑2 from September 10 to 24). UV treatment at high and medium dose showed a clear efficacy in comparison with the untreated (respectively, 63 and 37% on September 29, upper side of leaves) in the trial and had no apparent adverse effect on the crop.
Authors
J. De Mey, S. Pollet
Keywords
efficacy, IPM, dose-effect, fungi, ultraviolet
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