The dosage rate is 4 fl. Many who keep poinsettias assume that it will last for months in the home environment. Got itchy last night and started pruning - never realized Poinsettias are so sappy! Christopher J. Currey and Roberto G.Lopez Controlling height is an important aspect of poinsettia production. Poinsettias (potted). 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. 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. oz. DO … green leaves and stems), not reproductive (red bracts and cyathia). 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! 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. 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. green leaves and stems), not reproductive (red bracts and cyathia). Proper application of Bonzi will produce a much higher quality product. Roll, Eds. This site is maintained by Center for Agriculture, Food and the Environment in the College of Natural Sciences. There are several options for growth regulators on poinsettias and the chemicals and rates utilized vary considerably due to climate and grower preferences. 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. 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. Wilfret. and two doses of 3 ppm applied at 4 and 5 fl. Bract size. Use Bonzi PGR on container ornamentals in greenhouses, shade houses and nurseries. 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. Table 2. Late applications may result in excessive height reduction and/or reduced bract size. 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). Planting cuttings with long internodes start the plants at a disadvantage with some extra height even if the plants are to be pinched. Poinsettias are shade-avoiding plants, which is why they tend to stretch on the nursery without a reliable PGR programme. Tips on the use of chemical growth regulators on floriculture crops. Overall, bract diameter of was reduced by increases in Bonzi concentration, drench volume, and number of doses. Chemicals should not be sprayed because sprays may inhibit bract development. 1 4 33.7 36.1 50.6 54.5 31.7 29.3 4J2 12 We want to suppress vegetative growth Fig. These treatments provided active ingredient in the range of 0.09-0.24 mg a.i./pot. Hammer, P.A. Here are guidelines to consider when using Bonzi: Applications should be uniform, especially if you are using a drip system. Il raccourcit les entre-nœudset réduit ainsi l’allongement des plantes ornementales. 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. Plant size. Rates for Bonzi, Paczol Drenching Calculations- Rick Yates 2.20.09 . Using low levels of PGRs after the start of short days may help control stretch in these situations. 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. He will explore the Internet with you as your very own friend and sidekick! Bonzi peut être utilisé dans les poinsettias pendanttoute la période de culture et permet d’obtenir une couleur de feuille riche, 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. Our environmental conditions create a truly unique set of problems that must be overcome to produce a high quality product. It's like Ficus times 10 - white milky sap everywhere.... they look pretty cool though - good ramification. 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. Section 13, pp.75-77 in: H.K. of A-Rest or Bonzi. Date d'acquisition. 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. 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. Cycocel sprays have been the traditional growth retardant used on poinsettias. However, smaller plant diameter resulted from increases in Bonzi concentration or drench volume, but not number of doses. Effect ofBonzi drench applications on plant and bract size of 'Red Sails' poinsettia. PGR use is most likely on cultivars such as 'Success', and 'Monet'. A desirable level of plant size reduction without a reduction in bract diameter and no bract distortion resulted from one dose of 1 ppm Bonzi (all drench volumes) and 2 ppm (3 and 4 fl.oz.). One dose of Bonzi at 2 ppm applied at 5 fl. Of course, more labor is required to make drench applications compared to sprays. Poinsettia primer. 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. 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. If Bonzi (or another growth-retarding chemical) is applied too early in the crop schedule, or at … September 10, 2010. Tall cuttings, early planting and pinching, too close spacing, and inadequate light are the major causes of poinsettias finishing too tall. Hammer, T.J. 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. Control of late season stem elongation did not require the highest concentrations of Bonzi, large drench volumes, or two doses. 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. Sprays should be applied on the basis of volume of spray per square foot of bench (generally 1 gal./200 sq.ft.) 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. Read on for common pitfalls and how to avoid them. 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. However, foliar sprays of 25-50 ppm on poinsettia were nearly as effective as drenches and provided reasonable growth control. 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. 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. Although B-Nine is not particularly effective on poinsettias alone, when combined with Cycocel this combination works extremely well. to achieve uniform application. All of the causes of excess height interact to affect final plant height. 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. 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. Most of the poinsettia cultivars introduced within the last 10 years require less PGR than earlier types. 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. Anyone had any luck with this? Bring it inside. Starting in late October, higher drench rates can be used to provide stronger hold if needed with a slight reduction in bract size. 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. There were no significant differences in plant height among Bonzi-treated plants due to Bonzi concentration, drench volume, or number of doses. Drench applications are made on the basis of volume per pot (i.e., fl. One-half of the Bonzi-treated plants received a second dose two weeks later (11 November). Hartley, D.E. 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 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. after the Bonzi drench the plants generally grow an additional ½ – 1"/1.27 – 2.54 cm depending on the drench rate used. 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. Root rots, nutritional issues, environmental stress and PGR mistakes can all be costly in this high-value crop. 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. Subscribe. Treatment Plant height (cmz) Plant diameter (cm) Bractdiameter (cm) Bract internode length (cm) Bonzi Drench (ppm) (fl.