Job offersmore »
- Key Accountmanager Horticulture Glass
- Product & Applicatie Specialist Opkweek
- Assistant Grower - Canada
- Experienced International Buyer/Seller Germany
- Project and Sales Manager - Russia/Caucasian Region
- Quality Coordinator EU in Supply Chain Management Dep.
- Regional Sales Director - United States
- Territory Sales Position - US
- International Tomato Grower - Worldwide
- Grower Manager - US
Last commentsmore »
- India: Government gives 50% subsidy on a poly house (736)
- There's a bromeliad for everyone (1)
- Good opportunities to cultivate orchids in India (3)
- Development of the export oriented cut flower rose industry in Africa (4)
- Photoreport: Horticontact (4)
- "Horticulture in Iran can be an alternative to petroleum" (2)
- NL: Vreugdenhil Young Plants launches new concept Pick & Joy (1)
- Will sea freight be an alternative to Latin American air freight? (1)
Top 5 - yesterday
Top 5 - last week
Top 5 - last month
Exchange ratesmore »
Growth Control of Perennial FernsProduction of hardy ferns is becoming increasingly profitable as demand for these herbaceous perennials increases. However, growth management, especially of the larger species, in one-gallon pots can be very difficult.
At the request of a grower, we tested the use of the plant growth retardants (PGRs), Concise (uniconazole, Fine Americas, Inc.), Dazide (daminozide, Fine Americas, Inc.), or a tank mix of Dazide plus Citadel (chlormequat chloride, Fine Americas, Inc.), on two of the larger species.
We tested lady fern (Athyrium filix-femina) which is a very vigorous fern with an upright growth habit that can reach 2 to 4 feet tall and ostrich fern (Matteuccia struthiopteris), which has a vase shape with a more spreading habit than the lady fern and can get up to 6 feet tall under ideal field conditions.
Fall planted ferns were fully rooted with some shoot growth when donated to us by the grower in April. All plants were cut back uniformly to about 10 inches and PGRs were applied about 10 days after pruning. In addition to an untreated control group, PGR applications consisted of Concise foliar sprays at 30 or 60 ppm, Concise drenches (10 fl. oz. per pot) at 1 or 3 ppm, Dazide foliar spray at 5000 ppm, or a Tank Mix of Dazide:Citadel at 5000:1500 ppm applied as a foliar spray. All PGRs were applied twice, once at 10 days after cutting the plants back and again 18 days later. Plants were grown in an unheated cold frame mid-April through mid-June. Growth was measured at 0, 2, 4, and 6 weeks after the initial PGR treatment.
There were no statistically significant effects of the PGR applications on any of the growth measurements on either fern species. Although lady fern treated with Concise sprays at 30 or 60 ppm appeared to a bit “tighter”, the average plant height and width of the sprayed plants were actually slightly greater than those of the untreated plants (Photo 1). We found similar results with the Concise drenches, the Dazide sprays, or the Tank Mix spray applications.
With ostrich fern, there were no statistically significant differences in plant growth with any of the PGR applications and the appearance was not improved by the PGR treatments (Photo 2). In fact, we saw significant symptoms of phytotoxicity in response to all Concise applications (Photo 3). Although evident on both fern crops, the symptoms of twisting fronds was more pronounced on ostrich fern and still evident on the treated leaves at six weeks after initial treatment. These symptoms were not observed on plants treated with Dazide or the Tank Mix.
So, our initial study on growth regulation of two of the more vigorous hardy ferns did not identify successful PGR application protocols. As we’ve said before, PGR efficacy is affected by a number of factors. This paper reports the results of a single trial. We would like to encourage you to conduct your own trials. And, please share your results with us!!
Publication date: 12/20/2016
Other news in this sector:
Leave a comment: (max. 500 characters)
- All comments which are not related to the article contents will be removed.
- All comments with non-related commercial content, will be removed.
- All comments with offensive language, will be removed.