Foliar sprays of PGRs are more likely to reduce bract size than drenching. Therefore, it is probably worthwhile to leave at least 10 representative plants untreated to evaluate the effectiveness of the low concentration drench treatments. Use of Bonzi effectively reduces internode elongation, resulting in more desirable compact plants. Several Massachusetts growers have been making these treatments for a number of years and are pleased with the results. 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. Treatment effects on plant height were similar with one or two doses. Here are guidelines to consider when using Bonzi: Applications should be uniform, especially if you are using a drip system. Plant height and diameter reductions in this study were not excessive and would meet the objectives of late season stretch control for most growers. Effect ofBonzi drench applications on plant and bract size of 'Red Sails' poinsettia. green leaves and stems), not reproductive (red bracts and cyathia). oz./6 or 6½" pot. These treatments provided active ingredient in the range of 0.09-0.24 mg a.i./pot. It's like Ficus times 10 - white milky sap everywhere.... they look pretty cool though - good ramification. 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. 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. 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. oz./pot) so results are normally uniform. 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. 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. Many growers report too tall or "stretching" poinsettias late in the season. We want to suppress vegetative growth Fig. The Bonsai Zone, Early Work on My Show Trees, Part 2, July 2017 - Duration: 26:38. The volume of the drench together with ppm determines mg a.i./pot (Table 1). Bonzi® est un régulateur de croissance qui a de nombreuses applications. These drench treatments can be applied after October 15 into early November without affecting bract diameter. 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 should be uniformly moist when drench applications are made. Proper spacing is a key. 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. GrowerTalks. All plants were treated twice in September with a foliar spray of B-Nine and Cycocel. All of the causes of excess height interact to affect final plant height. 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. All Bonzi treatments resulted in shorter bract internode length compared to the control. Traditionally it has been recommended that plant growth regulators (PGRs) not be applied after mid-October or the start of short days (Hartley and Wilfret, 1992). of A-Rest or Bonzi. 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. Ohio Florists' Assoc., Columbus, OH., 60(7):52. Treatment Plant height (cmz) Plant diameter (cm) Bractdiameter (cm) Bract internode length (cm) Bonzi Drench (ppm) (fl. When used as directed, Bonzi produces no phytotoxic effects. This site is maintained by Center for Agriculture, Food and the Environment in the College of Natural Sciences. Tips on the use of chemical growth regulators on floriculture crops. Read on for common pitfalls and how to avoid them. It is used primarily as a soil drench application. Research shows early growing medium drenches with flurprimidol effectively control final poinsettia height. Planting cuttings with long internodes start the plants at a disadvantage with some extra height even if the plants are to be pinched. 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. One dose of Bonzi at 2 ppm applied at 5 fl. 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 Hammer, T.J. Best of all, he's FREE! Hartley, D.E. Got itchy last night and started pruning - never realized Poinsettias are so sappy! Starting in late October, higher drench rates can be used to provide stronger hold if needed, with a slight reduction in bract size. Section 13, pp.75-77 in: H.K.
2020 bonzi on poinsettias