Christopher J. Currey and Roberto G.Lopez Controlling height is an important aspect of poinsettia production. We want to suppress vegetative growth Fig. Control of late season stem elongation did not require the highest concentrations of Bonzi, large drench volumes, or two doses. Bract size. Bonzi “micro-drenches” were developed and named by Dr. Jim Barrett from the University of Florida. Hard pruning my 21 year old Poinsettia Bonsai. One dose of Bonzi at 2 ppm applied at 5 fl. Production de poinsettias – Phase 4. POINSETTIAS - DRENCH APPLICATION General Information GENERAL INFORMATION Bonzi is a plant growth regulator for use on ornamental plants grown in containers in nurseries, greenhouses, shadehouses, and interiorscapes. The stretching is influenced by the plant hormone gibberellic acid. He can talk, walk, joke, browse, search, e-mail, and download like no other friend you've ever had! 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. A-Rest, B-Nine, Bonzi, Cycocel, and Sumagic are plant growth regulators (PGRs) labelled for use on poinsettias. 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. Close spacing and inadequate light due to poor transmission by the greenhouse covering or cloudy weather are major causes of stretch late in the growing season. 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). Les poinsettias sont des plantes de jours courts dites nyctipériodiques, qui ne fleurissent que si la durée de la phase lumineuse durant un jour est de 12h à 13h. 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. September 10, 2010. green leaves and stems), not reproductive (red bracts and cyathia). Tayama, R.A. Larson, P.A. We have also found that bract development is affected less by Bonzi sprays than bythe B-Nine/Cycoceltank mix. The amount of active ingredient applied in each dose are shown in Table 1. Spraying is easiest but the least uniform way of applying PGRs to poinsettias. However, smaller plant diameter resulted from increases in Bonzi concentration or drench volume, but not number of doses. When used as directed, Bonzi produces no phytotoxic effects. An unexpected outcome was that differences in height among Bonzi-treated plants did not result from different concentrations, drench volumes or number of doses. However, you should not reuse any containers that were used to treat ornamentals with Bonzi. Welcome to the world of BonziBUDDY! Sprays should be applied on the basis of volume of spray per square foot of bench (generally 1 gal./200 sq.ft.) 1992. 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). The dosage rate is 4 fl. Il raccourcit les entre-nœudset réduit ainsi l’allongement des plantes ornementales. We want to suppress vegetative growth Fig. A-Rest, B-Nine, Bonzi, Cycocel, and Sumagic are plant growth regulators (PGRs) labelled for use on poinsettias. Poinsettias Bonzi for regulation of poinsettia growth: Bonzi has shown growth retarding activity on a wide range of ornamental species and at very low dosage rates. Table 2. green leaves and stems), not reproductive (red bracts and cyathia). Got itchy last night and started pruning - never realized Poinsettias are so sappy! PGR use can be reduced or eliminated by the starting with good quality cuttings, use of a tighter schedule, and by providing the plants with as much light as possible by proper spacing and maximizing light transmission. Bract diameter of Bonzi-treated plants was not different from the control treatment when one dose of PBZ was applied at 1 ppm at all drench volumes and 2 ppm at 3 and 4 fl.oz. 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. 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). oz./6 or 6Â½" pot. For traditional late-season growth control, drench with Bonzi in the north at ¼ to ½ ppm (0.75-1.5 oz/100 gal) and in the south at ½ to 1 ppm (1.5-3 oz/100 gal). Many who keep poinsettias assume that it will last for months in the home environment. Although B-Nine is not particularly effective on poinsettias alone, when combined with Cycocel this combination works extremely well. 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. Ultimately scheduling and the growing environment interact with cultivar to determine the need for PGR application. to achieve uniform application. The volume of the drench together with ppm determines mg a.i./pot (Table 1). Cycocel sprays have been the traditional growth retardant used on poinsettias. 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. Poinsettia Bonsai from Xmas gift : Today I am going to show you how to make poinsettia bonsai from Xmas / Christmas tree. Very low rates of paclobutrazol 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. 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. Plant height and diameter reductions in this study were not excessive and would meet the objectives of late season stretch control for most growers. Therefore, it is probably worthwhile to leave at least 10 representative plants untreated to evaluate the effectiveness of the low concentration drench treatments. Stock Solution Preparation: ppm Bonzi drench 1:100 injector Hozon using 5 gal bucket 5 gal bucket for hand dipping 1 3.33 oz per gal 2.5 oz per 5 gallons 1 tsp per 5 gallons 2 6.66 oz per gal 5.0 oz per 5 gallons 2 tsp per 5 gallons 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. When making PGR drenches, remember that the amount of active ingredient (mg a.i./pot) applied is more important than the concentration (ppm) of the drench solution. 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. It's like Ficus times 10 - white milky sap everywhere.... they look pretty cool though - good ramification. oz./pot. Plant height, plant diameter, and bract diameter were measured at the conclusion of the experiment (9 December). Root rots, nutritional issues, environmental stress and PGR mistakes can all be costly in this high-value crop. Oz) 1 dose 2 doses 1 dose 2 doses 1 dose 2 doses 1 dose 2 doses Control (no Bonzi) 39.0 59.3 33.5 5.1 1 3 35.7y 3M 53.9 56.0 31.8 30.8 A3 4J. Plants were pinched on 17 August leaving five or six nodes. GrowerTalks. Growth medium drench treatments were 1, 2, or 3 ppm Bonzi applied in volumes of 3, 4, or 5 fl. However, foliar sprays of 25-50 ppm on poinsettia were nearly as effective as drenches and provided reasonable growth control. Subscribe. DO … Plants should be fully turgid when PGRs are applied (Cycocel injury is most common on water-stressed plants). Bract internode length decreased with increases in Bonzi concentration and number of doses, but it was not affected by drench volume. Micro drenches of Bonzi can be used at any stage of production, and it will not decrease the bracts to an unsellable state. Planting cuttings with long internodes start the plants at a disadvantage with some extra height even if the plants are to be pinched. Their leaves are normally quite large (up to 15cm) but reduce well with standard bonsai techniques to around 1/3 normal size. Wilfret. Thus it isn't necessary to use the high levels of active ingredient which led to the reduced bract diameter recorded in this experiment. Drench solutions should be prepared to supply 1 or 2 ppm a.i. In the opinion of some, closely-spaced bracts make a more desirable poinsettia "flower.". Second, the growth during this time is vegetative (i.e. Bonzi® est un régulateur de croissance qui a de nombreuses applications. Also, because PGRs are treated as pesticides and have assigned re-entry intervals (12 hour REI - A-Rest, Cycocel, Sumagic; 24 hour REI - B-Nine, Bonzi), frequent use of PGRs may disrupt other work in some greenhouse operations. At this stage coloring and bract expansion were just beginning. The B-Nine is thought to act as a carrier for the Cycocel which increases its effectiveness and decreases the potential for phytotoxicity. 1996. Bonzi drenches can be utilized to encourage uniform poinsettias of ideal height without significant reductions in bract size. These drench treatments can be applied after October 15 into early November without affecting bract diameter. Starting in late October, higher drench rates can be used to provide stronger hold if needed with a slight reduction in bract size. ©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. The accompanying table has other suggestions for using low levels of A-Rest and Bonzi to control height. When used as … Tips on the use of chemical growth regulators on floriculture crops. These treatments provided active ingredient in the range of 0.09-0.24 mg a.i./pot. This technique proved to beparticularly effective when used late in the poinsettia season. 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. Normally PGRs are applied during cloudy weather. There are several options for growth regulators on poinsettias and the chemicals and rates utilized vary considerably due to climate and grower preferences. 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. Plant height and diameter reductions in this study were not excessive and would meet the objectives of late season stretch control for most growers. Bonzi peut être utilisé dans les poinsettias pendanttoute la période de culture et permet d’obtenir une couleur de feuille riche, Here are guidelines to consider when using Bonzi: Applications should be uniform, especially if you are using a drip system. Section 13, pp.75-77 in: H.K. For example, six-inch pots containing one pinched plant should be spaced 13x14" (i.e., a minimum of 1.2 sq. Plant size. Never use a "spreader-sticker" unless directed to by the label. Now that poinsettias are safely tucked into their prop trays and the threat of Erwinia (Pectobacterium) is almost over, it's time to think about other Poinsettia issues. apply the Bonzi at ¼ – ½ ppm in the North and ½ – 1 ppm in the … of PGR solution per pot at the time of treatment. Par Brian Cantin, Conseiller sénior aux producteurs. Please Log in or Create an account to join the conversation. and two doses of 3 ppm applied at 4 and 5 fl. oz. Poinsettia primer. 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. 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. Don't know if they can be wired at all - stems and branches are very fragile and snap extremely easy. GENERAL INFORMATION BONZI is a plant growth regulator for greenhouse use on container grown poinsettias and geraniums. The effectiveness of Cycocel and B-Nine is increased when conditions favor slow evaporation. 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). 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. oz./pot) so results are normally uniform. ©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. Use of Bonzi effectively reduces internode elongation, resulting in more desirable compact plants. Late applications may result in excessive height reduction and/or reduced bract size. PGRs must be applied uniformly in order to cause uniform inhibition to plant growth. Several Massachusetts growers have been making these treatments for a number of years and are pleased with the results. Nigel Saunders, The Bonsai Zone 68,575 views Poinsettias are shade-avoiding plants, which is why they tend to stretch on the nursery without a reliable PGR programme. Based on my results, the use of two doses of Bonzi drench or any combination of Bonzi concentration and drench volume resulting in a level of active ingredient above 0.24 mg a.i./pot risks a reduction in bract diameter and bract distortion. Treatment Plant height (cmz) Plant diameter (cm) Bractdiameter (cm) Bract internode length (cm) Bonzi Drench (ppm) (fl. Research shows early growing medium drenches with flurprimidol effectively control final poinsettia height. 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. Many growers report too tall or "stretching" poinsettias late in the season. Chemicals should not be sprayed because sprays may inhibit bract development. The Bonsai Zone, Early Work on My Show Trees, Part 2, July 2017 - Duration: 26:38. Foliar sprays of PGRs are more likely to reduce bract size than drenching. Roll, Eds. However, one might question if the "stretch" control gained offsets the time and labor involved in making the drench treatments. Email: email@example.com . 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. All of the causes of excess height interact to affect final plant height. Hammer, P.A. Plants were grown using standard commercial practices under natural light conditions. PGRs are very useful tools for controlling the height of poinsettias, but overeliance on PGRs is potentially costly in terms of material and labor. All Bonzi-treated plants received 6.8 fl.oz. It is used primarily as a soil drench application. Tall cuttings, early planting and pinching, too close spacing, and inadequate light are the major causes of poinsettias finishing too tall. Use of BONZI effecttvely reduces internode elongation, re8ulting in more desirable compo ct plants. PGRs may not be needed on small and small-medium types such as 'Freedom'. Effect ofBonzi drench applications on plant and bract size of 'Red Sails' poinsettia. Features - Poinsettias. Rooted cuttings of 'Red Sails' poinsettia were potted on 29 July 1999 in 6-inch azalea pots of Fafard 3B. Best of all, he's FREE! Bonzi Label Bonzi Label.pdf — PDF document, 208 kB (213,661 bytes) This project received support from the North Carolina Department of Agriculture and Consumer Services as part of the Specialty Crops Block Grant Program. ft./pot). No bract distortion was evident in any of the other treatments. PGR use is most likely on cultivars such as 'Success', and 'Monet'. 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. 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. Cared-for properly, the poinsettia will give weeks of color and pleasure to its owner. Official tennis player profile of Benjamin Bonzi on the ATP Tour. One-half of the Bonzi-treated plants received a second dose two weeks later (11 November). Read on for common pitfalls and how to avoid them. Overall, bract diameter of was reduced by increases in Bonzi concentration, drench volume, and number of doses. Growing poinsettias in Texas is a challenge. He will explore the Internet with you as your very own friend and sidekick! 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. All plants were treated twice in September with a foliar spray of B-Nine and Cycocel. Avec Bonzi, il est possible de produiredes poinsettias dans les proportions souhaitées. 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. Date d'acquisition. Keep poinsettias away from warm or cold drafts from radiators, air registers or open doors and windows. C… Poinsettias (potted). of A-Rest or Bonzi. Treatment effects on plant height were similar with one or two doses. oz. Starting in late October, higher drench rates can be used to provide stronger hold if needed, with a slight reduction in bract size.