Factors Affecting Infection of Lowbush Blueberry by Ascospores of<i>Monilinia Vaccinii-Corymbosi</i>

Hildebrand, P.D.; Braun, Peter

doi:10.1080/07060669109500935

Cited by 25 publications

(37 citation statements)

References 14 publications

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“…The F3 stage is when floral buds have expanded and separated and individual flower buds are distinct, and the F4 stage is when the corolla tubes are visible and begin to show white. The V4 stage is when the leaf buds have opened and leaves have separated (Hildebrand and Braun 1991). Perhaps it is at this stage that the shoot becomes nutritionally independent of rhizome carbohydrate reserves and there is enough exposed leaf surface for significant uptake of the herbicide to occur.…”

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confidence: 99%

“…Here, six weekly aqueous applications of 1.0 kg ha -1 hexazinone were applied from 1 May to 5 June, which spanned the pre -to post bloom stages. Floral and vegetative stages were described using the developmental guide that is used to forecast Monolinia twig and blossom blight (Hildebrand and Braun 1991) and which is familiar to most blueberry producers. Treatments were replicated three times in a randomized complete block design and the experiment was repeated at two locations.…”

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confidence: 99%

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Response of lowbush blueberry (Vaccinium angustifolium) to hexazinone applied early in the fruiting year

Jensen¹,

Specht²

2002

Can. J. Plant Sci.

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The wild lowbush blueberry (Vaccinium angustifolium Ait.) is economically the most important fruit crop of Atlantic Canada and the State of Maine. Some 70 000 to 90 000 t of fruit are produced annually on about 53 000 ha. Commercial blueberry fields have been developed from cleared forest or abandoned farmland where the lowbush blueberry is an early seral species. The crop is managed on a 2-yr production cycle. In the first year, plants are pruned by either burning or flail mowing, which promotes new shoot growth from rhizomes and increases flower bud development. In the second year, the crop blooms and produces fruit (Yarborough 1997).Weeds have always been a major production problem. Weeds of lowbush blueberry fields are mostly members of the native flora that are also promoted by the 2-yr crop cycle and include a wide range of perennial herbaceous and woody species that typically reflect the original flora of the field (Jensen 1985). Prior to 1980, weed control mainly involved cutting, burning, and directed spot sprays or rollerwiper applications of non-selective growth regulator herbicides for woody weed control. This changed in the early 1980s with the introduction of the broad spectrum s-triazinone, hexazinone. When applied pre-emergently in the spring after the pruning operation, but before the emergence of the new blueberry growth, 1.5 to 2.0 kg ha -1 hexazinone provided selective control of most grasses and sedges, and many of the common herbaceous broadleaf and woody weeds found in blueberry fields at that time (Jensen 1985). This pre-emergence application is also the most effective in controlling weeds, while later postemergence applications cause serious foliar damage to the crop (Jensen 1985). Weed control in the prune year increases blueberry stem density, numbers of flower buds per stem, and fruit yield (Eaton 1994;Jensen 1986;Yarborough et al. 1986). Applications at other times do not generally affect potential yields directly because these applications do not affect yield parameters.Initial applications of 1.5 to 2.0 kg ha -1 hexazinone to a blueberry field generally results in excellent residual weed control over the 2-yr crop cycle. Subsequently, rates are reduced to control mainly germinating weeds. Rates are also reduced in response to increasing concerns about erosion on vegetation-free soils and potential ground/water contamination. However, hexazinone persistence in blueberry field soils is relatively short. Less than 10% of applied hexazinone was recovered in the upper profile (0-45cm) of soils 2 mo after application and year-to-year carryover was <5% (Jensen and Kimball 1987). Hence, a number of native grass and herbaceous broadleaf weed species, e.g., Danthonia spicata, Rumex acetosella, and Solidago spp., either recover from low herbicide rates or re-establish from seed. These weeds impede harvesting and reduce marketable yield in the fruiting year. Earlier prune-year studies (Jensen 1985) had demonstrated that good control of some of these weeds could be obtained with only 1.0 kg ha ...

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confidence: 99%

mentioning

confidence: 99%

Response of lowbush blueberry (Vaccinium angustifolium) to hexazinone applied early in the fruiting year

Jensen¹,

Specht²

2002

Can. J. Plant Sci.

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“…Inoculum of M. vaccinii-corymbosi and potted blueberry plants were obtained and manipulated as described previously (3). Dormant plants were allowed to develop in the greenhouse and were used when 2-5 mm of green tissue had emerged from vegetative buds.…”

Section: Methodsmentioning

confidence: 99%

“…Recently, the susceptibility of developmental stages of buds and weather conditions that favor infection of lowbush blueberry by ascospores of M. vaccinii-corymbosi have been quantified (3). While this information is currently used to time protective sprays of triforine, timing could be further improved if the postinfection activity of triforine was known.…”

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confidence: 98%

Protectant and postinfection activity of triforine against ascospore infections ofMonilinia vaccinii-corymbosiin lowbush blueberries

Hildebrand

McRae

1995

Canadian Journal of Plant Pathology

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“…Variation in susceptibility of blueberry cultivars was shown to be related to the timing of their phenological development and the overlap with the timing of the release of ascospores (Pepin & Toms, ; Ehlenfeldt et al ., ). Based on previous research, floral buds were most susceptible at bud burst and tight cluster stages and vegetative buds were most susceptible when 6–13 mm of green tissue was presented (Ramsdell et al ., , ; Hildebrand & Braun, ). Reports from various blueberry‐growing regions in the US have provided contradictory information on the resistance/susceptibility of cultivars (Pepin & Toms, ; Stretch et al ., ; Pscheidt & Ocamb, ).…”

Section: Introductionmentioning

confidence: 99%

Timing of susceptibility of highbush blueberry cultivars in northwestern Washington to Monilinia vaccinii‐corymbosi, the cause of mummy berry

Harteveld

Peever

2017

Plant Pathology

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Mummy berry, caused by Monilinia vaccinii‐corymbosi, causes significant yield losses in blueberry fields in the coastal region of the Pacific Northwest, including northwestern Washington (WA). Development of effective disease control strategies are hindered by lack of knowledge of disease epidemiology in this region. This study compared floral and vegetative bud development of four blueberry cultivars, Duke, Bluecrop, Liberty and Draper, by evaluating the timing and number of susceptible buds on plants during the ascospore release period in two counties in northwestern WA in 2015 and 2016. Ascospores were detected from early March until early April in both years. All four cultivars presented susceptible vegetative and floral buds during this period but susceptible floral buds were consistently more numerous and observed earlier than vegetative buds. The timing of peak numbers of susceptible floral buds was earlier in cultivars Bluecrop and Duke compared to Draper and Liberty and peak numbers of susceptible vegetative buds of Bluecrop were observed earlier compared to the other three cultivars. Differences in susceptibility of these cultivars in the field may therefore depend on the timing of ascospore release relative to host development rather than differences in innate susceptibility. The frequency and spatial distribution of primary infections was also examined and seasonal variation was found in the incidence between bud types and no significant association between canopy heights. The outcomes of this research will be used to develop targeted and effective methods to prevent primary mummy berry infections in WA.

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Factors Affecting Infection of Lowbush Blueberry by Ascospores ofMonilinia Vaccinii-Corymbosi

Cited by 25 publications

References 14 publications

Response of lowbush blueberry (Vaccinium angustifolium) to hexazinone applied early in the fruiting year

Response of lowbush blueberry (Vaccinium angustifolium) to hexazinone applied early in the fruiting year

Protectant and postinfection activity of triforine against ascospore infections ofMonilinia vaccinii-corymbosiin lowbush blueberries

Timing of susceptibility of highbush blueberry cultivars in northwestern Washington to Monilinia vaccinii‐corymbosi, the cause of mummy berry

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