Hydrogen Cyanamide Accelerates Vegetative Budbreak and Shortens Fruit Development Period of Blueberry

Williamson, Jeffrey G.; Krewer, Gerard; Maust, B.E.; Miller, E. Paul

doi:10.21273/hortsci.37.3.539

Cited by 26 publications

(23 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The numbers of lateral vegetative budbreaks per centimeter of shoot length were increased by hydrogen cyanamide sprays for both cultivars and in both years (Tables 1-3). This result was expected and is consistent with known responses of southern highbush blueberry to hydrogen cyanamide (Williamson et al, 2001(Williamson et al, , 2002. In Expt.…”

Section: Resultssupporting

confidence: 91%

“…Hydrogen cyanamide has been used in blueberry production in the southeast United States to stimulate leaf growth and advance the ripening date of blueberries Williamson et al, 2001Williamson et al, , 2002. During these earlier experiments, observations revealed that poorly timed hydrogen cyanamide applications resulted in significant flower bud mortality, even though leaf growth was readily stimulated.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Evaluation of Flower Bud Removal Treatments on Growth of Young Blueberry Plants

Williamson¹,

NeSmith²

2007

horts

Self Cite

View full text Add to dashboard Cite

The effects of flower bud removal treatments on growth of young rabbiteye (Vaccinium ashei Reade) and southern highbush (V. corymbosum hybrids) blueberry plants were evaluated. Treatments consisted of pruning, hand stripping, and hydrogen cyanamide applications. The growth index of rabbiteye plants after the first spring growth cycle was unaffected by any of the flower bud removal treatments. However, the effects of flower bud thinning were cultivar specific for southern highbush blueberry plants. ‘Misty’ plants showed increases in total plant dry weight and in root, leaf, and stem dry weights from hand thinning and hydrogen cyanamide sprays. Conversely, ‘Santa Fe’ showed no increased growth response from any of the flower bud removal treatments. Flower bud mortality increased as hydrogen cyanamide spray concentration increased and was greater when applications were delayed so that flower buds were more advanced. Hydrogen cyanamide may have potential as an alternative to labor-intense flower bud removal practices such as hand stripping or pruning on young blueberry plants during establishment.

show abstract

Section: Resultssupporting

confidence: 91%

mentioning

confidence: 99%

Evaluation of Flower Bud Removal Treatments on Growth of Young Blueberry Plants

Williamson¹,

NeSmith²

2007

horts

Self Cite

View full text Add to dashboard Cite

show abstract

“…The points where the dashed lines cross the percent Bloom curves is where Spier 1985), it is likely that the chilling requirement of both cultivars had been met before the date at which GDD calculation began. Additionally, the use of hydrogen cyanamide helps satisfy the chilling requirement, although other effects of this chemical include increased rate of flower bud opening in the spring (Williamson et al, 2002). However, this latter effect would affect both cultivars similarly.…”

Section: Discussionmentioning

confidence: 99%

Inflorescence Bud Initiation, Development, and Bloom in Two Southern Highbush Blueberry Cultivars

Kovaleski

Williamson

Olmstead

et al. 2015

J. Amer. Soc. Hort. Sci.

Self Cite

View full text Add to dashboard Cite

Blueberry (Vaccinium spp.) production is increasing worldwide, particularly in subtropical growing regions, but information on timing and extent of inflorescence bud development during summer and fall and effects on bloom the next season are limited. The objectives of this study were to determine time of inflorescence bud initiation, describe internal inflorescence bud development, and determine the relationship between internal inflorescence bud development and bloom period the next spring in two southern highbush blueberry [SHB (Vaccinium corymbosum interspecific hybrids)] cultivars. ‘Emerald’ and ‘Jewel’ SHB buds were collected beginning in late summer until shoot growth cessation in late fall for dissection and identification of organ development. Inflorescence bud frequency and number, vegetative and inflorescence bud length and width throughout development, and bloom were also assessed. Inflorescence bud initiation occurred earlier in ‘Emerald’ compared with ‘Jewel’. Five stages of internal inflorescence bud development were defined throughout fall in both cultivars, ranging from a vegetative meristem to early expansion of the inflorescence bud in late fall. ‘Emerald’ inflorescence buds were larger and bloomed earlier, reflecting the earlier inflorescence bud initiation and development. Although inflorescence bud initiation occurred earlier in ‘Emerald’ compared with ‘Jewel’, the pattern of development was not different. Timing of inflorescence bud initiation influenced timing of bloom with earlier initiation resulting in earlier bloom.

show abstract

“…A delay in the onset of vegetative growth resulting from a lack of chilling would only exacerbate this problem. This situation may occur during mild winters in the southeast United States (Mainland, 1984;Williamson et al, 2002) and could be worsened by closing a high tunnel too early, potentially preventing the accumulation of chill hours. The situation is further complicated by the fact that some negation of chilling may occur if high temperatures occur during critical months (Lyrene and Williamson, 2004) as is likely in high tunnels.…”

Section: Discussionmentioning

confidence: 99%

Southern Highbush Blueberry Production in High Tunnels: Temperatures, Development, Yield, and Fruit Quality During the Establishment Years

Ogden¹,

Iersel²

2009

horts

View full text Add to dashboard Cite

Growers interested in producing early, high-quality, southern highbush blueberries (Vaccinium corymbosum L.) in high tunnels face a lack of information regarding appropriate cultural methods. We sought to elucidate the optimal date to close high tunnels to hasten vegetative and reproductive growth of organic southern highbush blueberry cultivars Emerald and Jewel grown in Georgia. The three dates selected to close the high tunnels were 15 Dec., 2 Jan., and 16 Jan. High tunnels raised soil and daytime air temperatures during winter months, but the tunnels did not retain heat at night and did not provide freeze protection without the use of propane heaters. The high tunnel microclimate advanced both vegetative and reproductive growth compared with outdoor plants. Averaged over the 2-year study, the 15 Dec. tunnel closure advanced flower initiation by 38 days for ‘Emerald’ and 39 days for ‘Jewel’ compared with outdoor control plants. Synchronization of flowering of the two cultivars was poor in 2007 when ‘Emerald’ flowered much earlier than ‘Jewel’ and much better in 2008. In 2007, flower and fruit development of ‘Jewel’ were faster than that of ‘Emerald’ with Jewel going from the appearance of individual flowers to ripe fruit in 80 days as compared with 105 days for ‘Emerald’. Total yield was strongly correlated with fruit set (r = 0.94). ‘Emerald’ fruit contained higher concentrations of soluble solids and anthocyanins than ‘Jewel’ fruit, and anthocyanin concentrations increased throughout the harvest period. No fruit matured in 2008 as a result of freeze damage. The biggest obstacle for high tunnel production of southern highbush blueberries appears to be preventing freeze damage and assuring pollination. Cost-effective freeze protection and ways to promote good fruit set will be critical to successful production of early southern highbush blueberries in high tunnels.

show abstract

Hydrogen Cyanamide Accelerates Vegetative Budbreak and Shortens Fruit Development Period of Blueberry

Cited by 26 publications

References 8 publications

Evaluation of Flower Bud Removal Treatments on Growth of Young Blueberry Plants

Evaluation of Flower Bud Removal Treatments on Growth of Young Blueberry Plants

Inflorescence Bud Initiation, Development, and Bloom in Two Southern Highbush Blueberry Cultivars

Southern Highbush Blueberry Production in High Tunnels: Temperatures, Development, Yield, and Fruit Quality During the Establishment Years

Contact Info

Product

Resources

About