Environmental conditions, such as water stress and/or heat stress, can also contribute to inconsistent responses.Īpple Return Bloom Programs for the Southeast Additionally, inconsistent/poor responses may be observed with weak trees, excessively vigorous trees, and unpruned/heavily shaded trees. Blocks/trees with excessively heavy crop loads may not respond to return bloom sprays. While these products are useful management tools in apple production, adoption/use will not result in miracles. Plant growth regulators that promote return bloom can help mitigate biennial bearing of apple. Conversely, single-application ethephon programs require a separate trip through the orchard and application rates are variety specific and/or subjective. As stated above, NAA programs can be incorporated into cover sprays and use a consistent rate across cultivars. (2007) determined that four bi-weekly applications of 5 ppm NAA was generally as effective as a single application Ethrel. The 2 nd application occurs 2 to 3 weeks after the initial application.īoth programs have been effective in the southeastern US. On varieties with a strong biennial bearing habit (Fuji and Cameo), a 2 nd application of ethephon should be considered. As a result, this application must occur as a separate spray and requires an additional trip through the orchard. Ethephon rates are determined by several factors, including: variety, crop load, and history of biennial bearing (see table below for rates). NAA can be included in cover sprays.Ģ) In the southeast, an ethephon program (Ethrel Ethephon 2 Motivate TM, etc.) tends to be a single application at ~ 6 to 8 weeks after bloom. With summer NAA programs, the rate is constant regardless of variety. These applications generally occur in June and July. In the southeast, there are two different programs that are used to promote return bloom:ġ) A summer NAA program (Fruitone L® PoMaxaTM RefineTM, etc.) consists of four bi-weekly sprays of 5 ppm NAA. Since, products that promote return bloom also have thinning activity, return bloom programs should not be initiated until fruit size is >30 mm (i.e. In general, this is an appropriate timing to initiate a return bloom programs. On most varieties, final fruit set is apparent and trees are insensitive to chemical thinner applications (>30 mm fruit size ~ 6 weeks after petal fall). In varieties that are very prone to biennial bearing (Golden Delicious, Red Delicious, Fuji, Cameo, Honeycrisp, etc.) the use/adoption of a return bloom program is essential to promote consistent cropping. In years of variable fruit set, applying products that promote return bloom is relatively cheap insurance to promote adequate/consistent cropping in the following year (2019). Given this laundry list of environmental/production challenges, I expect a wide range of thinning responses in apple. > 20 inches of rain in a two-week period.inclement weather during the rescue-thinning window, and/or.cloudy and warm conditions during the rescue-thinning window,.high temperatures during the post-bloom chemical thinning window,.sub-lethal cold damage to spur leaves and/or fruit,.poor conditions for pollinator activity during bloom,.blossom/bud mortality due to cold weather (up to 3 potentially damaging cold fronts),.To date, some sites/growers in the southeast observed the following: While the growing season is still young, we’ve observed multiple environmental challenges in 2018. Please note that some applications and/or services may not function as expected when translated. NC State Extension does not guarantee the accuracy of the translated text. As with any Internet translation, the conversion is not context-sensitive and may not translate the text to its original meaning. To the extent there is any conflict between the English text and the translation, English controls.Ĭlicking on the translation link activates a free translation service to convert the page to Spanish. Por favor, tenga en cuenta que algunas aplicaciones y/o servicios pueden no funcionar como se espera cuando se traducen.Įnglish is the controlling language of this page. NC State Extension no garantiza la exactitud del texto traducido. Al igual que con cualquier traducción por Internet, la conversión no es sensible al contexto y puede que no traduzca el texto en su significado original. En la medida en que haya algún conflicto entre la traducción al inglés y la traducción, el inglés prevalece.Īl hacer clic en el enlace de traducción se activa un servicio de traducción gratuito para convertir la página al español. El inglés es el idioma de control de esta página.
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