Horticultura Brasileira (2007) 25, 544-549

João Américo Wordell Filho, Daniel A. Martins and Marciel J. Stadnik (2007)
Aplicação foliar de tratamentos para o controle do míldio e da podridão-de-escamas de bulbos de cebola
[Foliar spray of treatments in the control of downy mildew and bulb rot in onion]
Horticultura Brasileira 25 (4), 544-549
Abstract: A field experiment was carried out to evaluate the effect of foliar sprays with the following treatments on the downy mildew (Peronospora destructor) and bulb rot (Burkholderia cepacia) in onions: non-treated control, fungicide chlorotalonil/metalaxyl + chlorotalonil, potassium phosphite, foliar fertilizer (03-00-16, N-P-K), bordeaux mixture, bordeaux mixture/potassium phosphite, acibenzolar-S-methyl weekly applied; extract of alga Ulva fasciata and ulvan sprayed every 7, 14 and 21 days. Only the weekly spraying of fungicides and fertilizer (03-00-16, 400 mL/100 L) significantly reduced the mildew severity by 60 and 23%, respectively, but did not increase the bulb yield. The foliar application of potassium rich fertilizers resulted in a higher incidence of rotten bulbs after 5 months in storage. Soluble sugar content and rot incidence of onion bulbs were significantly correlated (-0,629, p < 0,05).
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Portuguese)
Full text of article
Database assignments for author(s): Marciel J. Stadnik

Research topic(s) for pests/diseases/weeds:
control - general

---

Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Peronospora destructor	Onion/garlic/leek (Allium)	Brazil (south)
	Burkholderia cepacia	Onion/garlic/leek (Allium)	Brazil (south)