On the disease front, black root rot, downy mildew, grey mould, leaf spots, rust and white rust have been reported in the past four weeks.
Crops of Primula have been particularly affected with low levels of aphid, instances of caterpillar, leaf hopper and leaf spots. In treating aphid, correct identification of the pest is required before applying pesticides, while leaf spots can be treated by disposing of infected crop and removing damaged foliage by hand.
Garden Chrysanthemums have been affected by leaf miner, which appears more in crops grown under higher temperatures. Minor damage can be treated by removing infected foliage, otherwise insecticides can be used. White rust has also been observed and sub-irrigation of crops can help reduce the disease.
Downy mildew continues to affect pansy and Viola, and the report recommends infected plants be bagged up and removed from the glasshouse.
- For full details, see Bedding & Pot Plant Notes, www.adas.co.uk