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Research projects archive

Research projects archive

HNS 196 - Identification of inoculum sources for the newly emerged Peronospora causing downy mildew on aquilegia

Start Date: 
01/10/2015

Aquilegia downy mildew is caused by a species of Peronospora which is currently unnamed. The first occurrence of the disease appears to be on a nursery in 2011, with more widespread reports in gardens during 2013. Little or no work has been published on the disease and as a result it is difficult to establish from the literature why the disease has become more prevalent. This project aims to establish the main sources of inoculum for the disease on nurseries

HNS 187a - Evaluating the potential of plant growth regulators to limit plant growth on tree and hedging species

Start Date: 
02/04/2015

Although widely used in other sectors, plant growth regulators are not currently applied to field grown tree and hedging species; a limited number of products (e.g. daminozide) have been tested by the industry (with limited success) prior to HDC project HNS 187. Undercutting is currently used as a means of limiting plant growth during the growing season. This technique cannot be carried out during periods of dry weather, as experienced during summer 2010 and 2011 in many parts of the UK. This project was designed to determine the ability of some chemical growth regulators to reduce the growth of deciduous field grown nursery stock during the growing season. The first year of the project (HNS 187) demonstrated that it was possible to limit the height of some key species (particularly Sorbus & Populus) through the use chemical plant growth regulators. The high rates of chlormequat used in year one of the trial generally resulted in useful height reductions however phytotoxic damage was unacceptable. In the second years trials (which were carried out in 2014) rates of plant growth regulators were reduced where necessary, to attempt to reduce phytotoxicity to an acceptable level whilst achieving the necessary growth control. Further reductions in rates and different timings are needed in some cases to strike the balance between achieving the desired amount of growth regulation whilst minimising crop damage to an acceptable level. Two additional growth regulators (Moddus & Cutaway) containing the same active (trinexapac ethyl) were included in 2014 trials. Both products were included because Moddus can be used on Forest nurseries under EAMU 2055/12. From past experience it was considered unlikely that the maximum permitted rate on the EAMU would achieve the desired growth regulation; this was proven in the trials carried out in 2014. Meanwhile three applications of Cutaway proved very useful on Sorbus, one of the five species tested – resulting in a near perfect crop. A further years’ work will allow us to build on the results to date, further fine tuning rates and timings. This should result in recommendations that UK growers can use in the future. Cutaway is not currently authorised for use on Forest nurseries or Ornamental plant production, however the results obtained in this project should help to support an EAMU for use in the aforementioned crops.

CP 108 - AHDB Farm Scale Resource Use Efficiency Calculator

Start Date: 
01/05/2013

AHDB wishes to build awareness and understanding in their stakeholder communities of the way that farm management decisions on the use of resources (including land) determine environmental impacts

HNS 167 - Hardy Ornamental Nursery Stock: preventing outdoor container grown nursery stock plants rooting through into capillary sand beds via the use of herbicide treatments to the surface of the bed

Start Date: 
01/06/2008

This project is to identify suitable products or product combinations that can be used to replace the herbicide product Ardent in container grown nursery stock production after 31 August 2008 to m