Tips on the use of chemical growth regulators on floriculture crops. Please Log in or Create an account to join the conversation. In these examples we will use a combination of sprays, early drenches and a late drench to achieve desired heights. The table accompanying this article, taken from the 2003-2004 edition of New England Floricultural Recommendations, provides the rates for use in New England and describes the specific conditions and methods for applying each PGR. ©2020 University of Massachusetts Amherst • Site Policies, Greenhouse Best Management Practices (BMP) Manual, New England Greenhouse Floriculture Guide, Pesticide Information (Labels, MSDS, WPS), Pesticide Licensing (Certification, Exams, Workshops), Soil and Plant Nutrient Testing and Diagnostics, Center for Agriculture, Food, and the Environment, Center for Agriculture, Food and the Environment. Subscribe. Use Bonzi PGR on container ornamentals in greenhouses, shade houses and nurseries. Bring it inside. Planting cuttings with long internodes start the plants at a disadvantage with some extra height even if the plants are to be pinched. The objective of this study, supported by the Massachusetts Flower Growers' Association, was to test Bonzi for late season height control by studying the effects of Bonzi concentration, drench volume applied, and number of doses. Keeps you informed of late breaking news! When used as … Most of the poinsettia cultivars introduced within the last 10 years require less PGR than earlier types. Nos spécialistes ont réuni à votre intention des informations et conseils pour cultiver au mieux les poinsettias - afin qu'ils restent toujours beaux et en bonne santé! Plants were grown using standard commercial practices under natural light conditions. These drench treatments can be applied after October 15 into early November without affecting bract diameter. There were no significant differences in plant height among Bonzi-treated plants due to Bonzi concentration, drench volume, or number of doses. Several Massachusetts growers have been making these treatments for a number of years and are pleased with the results. GrowerTalks. Starting in late October, higher drench rates can be used to provide stronger hold if needed, with a slight reduction in bract size. September 10, 2010. Left in the car, however, it may not fair so well. In this study Bonzi was applied to poinsettia by overhead drench or subirrigation either one time using concentrated solutions or 10 times using very dilute solutions. Bract size. Using low levels of PGRs after the start of short days may help control stretch in these situations. Tall cuttings, early planting and pinching, too close spacing, and inadequate light are the major causes of poinsettias finishing too tall. Avec Bonzi, il est possible de produiredes poinsettias dans les proportions souhaitées. The B-Nine is thought to act as a carrier for the Cycocel which increases its effectiveness and decreases the potential for phytotoxicity. One dose of Bonzi at 2 ppm applied at 5 fl. This site is maintained by Center for Agriculture, Food and the Environment in the College of Natural Sciences. However, foliar sprays of 25-50 ppm on poinsettia were nearly as effective as drenches and provided reasonable growth control. Starting in late October, higher drench rates can be used to provide stronger hold if needed with a slight reduction in bract size. Bonzi drenches can be utilized to encourage uniform poinsettias of ideal height without significant reductions in bract size. Poinsettia Bonsai from Xmas gift : Today I am going to show you how to make poinsettia bonsai from Xmas / Christmas tree. For traditional late-season growth control, drench with Bonzi in the north at ¼ to ½ ppm (0.75 to 1.5 ounces/100 gallons) and in the south at ½ to 1 ppm (1.5 to 3 ounces/100 gallons). Got itchy last night and started pruning - never realized Poinsettias are so sappy! In 1988, research conducted by Dr. Jim Barrett at theUniversity of Florida demonstrated the potential of Bonzi (paclobutrazol)drenches for poinsettia height control. Also, by avoiding the highest levels of active ingredient (two doses of 0.36 mg a.i./pot or one or two doses of 0.45 mg a.i./pot), so too can the bract distortion observed in some treatments. Control of late season stem elongation did not require the highest concentrations of Bonzi, large drench volumes, or two doses. oz., one dose of 3 ppm at all drench volumes, and two doses of all combinations of Bonzi and drench volume resulted in smaller bract diameter than the control. Sprays should be applied on the basis of volume of spray per square foot of bench (generally 1 gal./200 sq.ft.) We have also found that bract development is affected less by Bonzi sprays than bythe B-Nine/Cycoceltank mix. In the warmer temperatures of the deep south, we generally use chemical than would be used in cooler regions. Florida has demonstrated that applying growth retardants as a drench provides excellent height control and is safer than sprays. Although there are a number of things that can go wrong from now until December 25, there are a few of these that seem to reoccur each year. Normally PGRs are applied during cloudy weather. z2.54 centimeters (cm)=1 inch.yA value that has been boldfaced means that it is significantly different from the control by Dunnett's procedure, p=0.05. Growing poinsettias in Texas is a challenge. Connect with UMass Extension Greenhouse Crops & Floriculture Program: UMass Research and Education Center Farms, Conservation Assessment Prioritization System (CAPS), Extension Risk Management/Crop Insurance Education, North American Aquatic Connectivity Collaborative, Civil Rights and Non-Discrimination Information. Growth medium drench treatments were 1, 2, or 3 ppm Bonzi applied in volumes of 3, 4, or 5 fl. ft./pot). My results demonstrate that Bonzi applied as a drench at low concentrations during the early stages of bract expansion and coloring is effective at suppressing the height and diameter of poinsettia. Micro drenches of Bonzi can be used at any stage of production, and it will not decrease the bracts to an unsellable state. Plant height, plant diameter, and bract diameter were measured at the conclusion of the experiment (9 December). Features - Poinsettias. At this time 5-6 bracts were fully colored and close to full expansion while many smaller leaves were in earlier stages of coloring and expansion. An unexpected outcome was that differences in height among Bonzi-treated plants did not result from different concentrations, drench volumes or number of doses. Many growers report too tall or "stretching" poinsettias late in the season. Also, based on my personal observations in some local greenhouses, it is sometimes hard to tell whether there has been any actual control of stretch to justify the effort invested in making the drench treatments. Il raccourcit les entre-nœudset réduit ainsi l’allongement des plantes ornementales. A-Rest, B-Nine, Bonzi, Cycocel, and Sumagic are plant growth regulators (PGRs) labelled for use on poinsettias. Cared-for properly, the poinsettia will give weeks of color and pleasure to its owner. Drench applications of PGRs are laborious and mistakes in mixing or applying solutions could be disastrous in terms of too much growth control, uneven results, or bract injury. Tayama, R.A. Larson, P.A. Proper spacing is a key. The accompanying table has other suggestions for using low levels of A-Rest and Bonzi to control height. Use of Bonzi effectively reduces internode elongation, resulting in more desirable compact plants. Hammer, P.A. Nigel Saunders, The Bonsai Zone 68,575 views However, one might question if the "stretch" control gained offsets the time and labor involved in making the drench treatments. Plants potted in July and early August often end up too tall because of the extra time for vegetative growth between planting, pinching, and the initiation of flower buds. Par Brian Cantin, Conseiller sénior aux producteurs. Many who keep poinsettias assume that it will last for months in the home environment. Plant height and diameter reductions in this study were not excessive and would meet the objectives of late season stretch control for most growers. First, poinsettias begin to grow at their most rapid pace during this period, evident by the sigmoidal shape of poinsettia growth curves (some cultivars can be more vigorous during this time than others). This site is maintained by Center for Agriculture, Food and the Environment in the College of Natural Sciences. Plants should be fully turgid when PGRs are applied (Cycocel injury is most common on water-stressed plants). You can also use it on ornamental plants throughout interiorscapes according to the label. Bonzi “micro-drenches” were developed and named by Dr. Jim Barrett from the University of Florida. Bonzi peut être utilisé dans les poinsettias pendanttoute la période de culture et permet d’obtenir une couleur de feuille riche, Very low rates of Bonzi are drenched on the poinsettia crop as often as once a week in combination with graphical tracking to achieve optimal crop height, with little or no risk of reducing bract size. However, smaller plant diameter resulted from increases in Bonzi concentration or drench volume, but not number of doses. Roll, Eds. The Bonsai Zone, Early Work on My Show Trees, Part 2, July 2017 - Duration: 26:38. Drench solutions should be prepared to supply 1 or 2 ppm a.i. They do however make excellent subjects for bonsai, poinsettias readily take to hard pruning and bud back with ease, with age their light brown bark becomes deeply furrowed and gives a strong impression of age. apply a late-season Bonzi drench one to two weeks before shipping when the plants are almost at finished height with at least two to three bracts in full color. Use of BONZI effecttvely reduces internode elongation, re8ulting in more desirable compo ct plants. He can talk, walk, joke, browse, search, e-mail, and download like no other friend you've ever had! The dosage rate is 4 fl. Bract internode length (measured from the top of the cyathia to the lowermost bract showing red color) was also measured at the end of the experiment to determine how treatments affected bract spacing. Connect with UMass Extension Greenhouse Crops & Floriculture Program: UMass Research and Education Center Farms, Conservation Assessment Prioritization System (CAPS), Extension Risk Management/Crop Insurance Education, North American Aquatic Connectivity Collaborative, Civil Rights and Non-Discrimination Information. The amount of active ingredient applied in each dose are shown in Table 1. It is used primarily as a soil drench application. Wilfret. All of the causes of excess height interact to affect final plant height. Chemicals should not be sprayed because sprays may inhibit bract development. When used as directed, Bonzi produces no phytotoxic effects. PGRs are very useful tools for controlling the height of poinsettias, but overeliance on PGRs is potentially costly in terms of material and labor. A-Rest, B-Nine, Bonzi, Cycocel, and Sumagic are plant growth regulators (PGRs) labelled for use on poinsettias. Production de poinsettias – Phase 4. Official tennis player profile of Benjamin Bonzi on the ATP Tour. Hartley, D.E. Rates for Bonzi, Paczol Drenching Calculations- Rick Yates 2.20.09 . Root rots, nutritional issues, environmental stress and PGR mistakes can all be costly in this high-value crop. On 24 September, when the lateral shoots were about four inches long, plants were sprayed with a solution of 1000 ppm B-Nine and 500 ppm Cycocel. Treatment effects on plant height were similar with one or two doses. One-half of the Bonzi-treated plants received a second dose two weeks later (11 November). For example, Bonzi (paclobutrazol, Syngenta Professional Products) is often used as a drench during poinsettia production to reduce unwanted stem elongation late in the crop. Poinsettias are shade-avoiding plants, which is why they tend to stretch on the nursery without a reliable PGR programme. Growers can try to control late season stretch by applying a very dilute drench of A-Rest or Bonzi. This technique proved to beparticularly effective when used late in the poinsettia season. These treatments provided active ingredient in the range of 0.09-0.24 mg a.i./pot. Read on for common pitfalls and how to avoid them. At this stage coloring and bract expansion were just beginning. This explains why at any ppm level different application volumes may affect plant growth to a different degree and why inaccurate volume measurement during drenching leads to uneven results. Thus it isn't necessary to use the high levels of active ingredient which led to the reduced bract diameter recorded in this experiment. 1 4 33.7 36.1 50.6 54.5 31.7 29.3 4J2 12 Hard pruning my 21 year old Poinsettia Bonsai. Actual volume depends on pot size. Our environmental conditions create a truly unique set of problems that must be overcome to produce a high quality product. However, some recent recommendations (Hammer, 1996; Moore, 1996) suggest that growth medium drench applications of very low concentrations (1-2 ppm) of Bonzi or A-Rest can be used late season stretch of poinsettia with minimal affect on bract diameter. All plants were treated twice in September with a foliar spray of B-Nine and Cycocel. Anyone had any luck with this? Late applications may result in excessive height reduction and/or reduced bract size. Some of the reasons for stretch include: missed early season PGR applications, periods of unusually favorable growing conditions, or elongation due to too close spacing or low light intensity due to cloudy weather. Ohio Florists' Assoc., Columbus, OH., 60(7):52. There are several options for growth regulators on poinsettias and the chemicals and rates utilized vary considerably due to climate and grower preferences. Second, the growth during this time is vegetative (i.e. Resources from UMass Extension and the Center for Agriculture, Food and the Environment: ag.umass.edu/coronavirus. Welcome to the world of BonziBUDDY! Date d'acquisition. The effectiveness of Cycocel and B-Nine is increased when conditions favor slow evaporation. PGRs may not be needed on small and small-medium types such as 'Freedom'. It's like Ficus times 10 - white milky sap everywhere.... they look pretty cool though - good ramification. Growth medium should be uniformly moist when drench applications are made. after the Bonzi drench the plants generally grow an additional ½ – 1"/1.27 – 2.54 cm depending on the drench rate used. Spraying is easiest but the least uniform way of applying PGRs to poinsettias. Rooted cuttings of 'Red Sails' poinsettia were potted on 29 July 1999 in 6-inch azalea pots of Fafard 3B. This distortion occurred on the bracts of some, but not all, plants drenched with one dose of Bonzi applied at 3 ppm and 5 fl. Proper application of Bonzi will produce a much higher quality product. If Bonzi (or another growth-retarding chemical) is applied too early in the crop schedule, or at … This can be done when the plants are about ½ to 1 inch below the desired height and/or one to two weeks (up to three weeks in the south) before shipping. The first treatment of 2000 ppm B-Nine and 1000 ppm Cycocel was applied 10 September when the lateral shoots were about two inches long. PGRs must be applied uniformly in order to cause uniform inhibition to plant growth. PGR use is most likely on cultivars such as 'Success', and 'Monet'. oz./pot. Overall, bract diameter of was reduced by increases in Bonzi concentration, drench volume, and number of doses. Christopher J. Currey and Roberto G.Lopez Controlling height is an important aspect of poinsettia production. Bonzi applied during the early stages of bract formation and coloring generally resulted in shorter plants and smaller plant diameter compared to the control treatment (Table 2). For example, six-inch pots containing one pinched plant should be spaced 13x14" (i.e., a minimum of 1.2 sq. All Bonzi-treated plants received 6.8 fl.oz. However, you should not reuse any containers that were used to treat ornamentals with Bonzi. Of course, more labor is required to make drench applications compared to sprays. Although B-Nine is not particularly effective on poinsettias alone, when combined with Cycocel this combination works extremely well. Table 2. Second, the growth during this time is vegetative (i.e. Plant height and diameter reductions in this study were not excessive and would meet the objectives of late season stretch control for most growers. Don't know if they can be wired at all - stems and branches are very fragile and snap extremely easy. to achieve uniform application. All plants, with the exception of the control group, were treated with a Bonzi drench as soon as 2 or 3 of the uppermost leaves showed some red coloring (28 October). Additional specific precautions are discussed in the accompanying table. Never use a "spreader-sticker" unless directed to by the label. and two doses of 3 ppm applied at 4 and 5 fl. The stretching is influenced by the plant hormone gibberellic acid. We want to suppress vegetative growth Fig. First, poinsettias begin to grow at their most rapid pace during this period, evident by the sigmoidal shape of poinsettia growth curves (some cultivars can be more vigorous during this time than others). The table accompanying this article, taken from the 2003-2004 edition of New England Floricultural Recommendations, provides the rates for use in New England and describes the specific conditions and methods for applying each PGR.
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