History of Bulb Growing in Washington State

Gould, C. J.

doi:10.17660/actahortic.1990.266.1

Cited by 4 publications

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“…The mild, maritime climate along the coastal areas of western Washington provides optimal growing conditions for spring flowering bulbs (Gould, 1993). Annually, about 130 ha of field-grown bulbous iris (Iris x hollandica) are produced in western Washington.…”

Section: Introductionmentioning

confidence: 99%

Efficacy of Fungicides in Controlling Leaf Spot on Bulbous Iris

Chastagner¹,

Kaufmann²

2005

Acta Hortic.

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Annually, about 130 ha of field-grown bulbous iris (Iris x hollandica) are produced in western Washington. The production of iris bulbs and cut flowers has an estimated value of $3.4 to 5.6 million. Leaf spot or "fire", caused by Mycosphaerella macrospora, is the most important foliar disease on this crop. Two trials were conducted to compare the efficacy of several standard and newer "reduced risk" fungicides for their ability to control leaf spot on two-year-old plantings of 'Saturnus' and 'Apollo' iris. Applications of Compass 50W (trifloxystrobin), Daconil Ultrex 82.5WP (chlorothalonil), Decree 50WDG (fenhexamid), Heritage 50WG (azoxystrobin), Insignia 20WP (pyraclostrobin), Medallion 50WP (fludioxonil), Phyton-27 (copper sulfate), Switch 62.5WG (cyprodinil + fludioxonil), and 26GT 23.3 (iprodione) were applied to plants at approximately 14 day intervals from 12 February through 21 May, 2003. The plot design was a randomized complete block with three blocks per cultivar. Treatments were applied to 1.5 m of row in each block. Disease pressure was high during late May and early June. On 'Apollo' iris, applications of Insignia, Heritage and 26GT provided excellent disease control and reduced the percentage of foliage that was killed. Insignia and Heritage also provided excellent disease control on 'Saturnus' iris. Applications of Medallion, Daconil Ultrex, and 26GT also reduced the level of disease compared to the unsprayed check. The results of these trials indicate that Insignia and Heritage have the potential to provide control of iris leaf spot that is equal to or better than that achieved by the standard materials used by growers.

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Section: Introductionmentioning

confidence: 99%

Efficacy of Fungicides in Controlling Leaf Spot on Bulbous Iris

Chastagner¹,

Kaufmann²

2005

Acta Hortic.

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“…Ornamental bulbs represent an important high value minor crop in western Washington. Over 90% of the field grown daffodils, tulips, and bulbous iris produced in the United States are grown on approximately 809 ha in western Washington (Gould, 1990;Krause,1991;De Hertogh and Le Nard, 1993). One of the most important disease management problems currently facing the bulb industry in the United States is the loss of formaldehyde.…”

Section: Introductionmentioning

confidence: 99%

Potential Use of Chlorine Dioxide to Prevent the Spread of Fusarium Basal Rot During the Hot Water Treatment of Daffodil Bulbs

Chastagner

Riley

2002

Acta Hortic.

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Historically, formaldehyde has been used extensively by bulb growers to prevent the spread of basal rot (Fusarium oxysporum f. sp. narcissi) during the hot water treatment (HWT) of daffodil bulbs. A number of restrictions have been placed on the use of formaldehyde in the United States which have limited the number of growers that are able to use formaldehyde. During the past five years, a research program to identify potential formaldehyde replacements has been proceeding at WSU-Puyallup. One potential is chlorine dioxide, which has been used increasingly as a replacement for chlorine in the fruit and vegetable industries. Research has shown that the activity of chlorine dioxide in the presence of high levels of organic matter, such as that found in dump tanks, is not diminished as rapidly as chlorine. In addition, research has shown that chlorine dioxide has a higher biocidal activity on a ppm basis against several microorganisms in comparison with sodium hypochlorite, iodine, quaternary ammonium compounds, glutaraldehyde, and phenol. Results from our HWT basal rot trials indicate that chlorine dioxide at 5 to 10 ppm effectively controls Fusarium inoculum levels during HWT of daffodil bulbs and thus protects bulbs from the spread of basal rot. There was also no indication of any adverse effects on the growth of bulbs following treatment.

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Das Problem des Anfangs

Stefan¹

1999

Erkenntnis — Konstruktivismus — Systemtheorie

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History of Bulb Growing in Washington State

Cited by 4 publications

References 0 publications

Efficacy of Fungicides in Controlling Leaf Spot on Bulbous Iris

Efficacy of Fungicides in Controlling Leaf Spot on Bulbous Iris

Potential Use of Chlorine Dioxide to Prevent the Spread of Fusarium Basal Rot During the Hot Water Treatment of Daffodil Bulbs

Das Problem des Anfangs

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