Garden roses-Red Spider Mite

Red Spider Mite – a problem during the dry hot summer months 

 

Visual symptoms of Red Spider Mite damage: Webs on the leaves and flowers and grey colors on the leaves.

clip_image001[9]

General

The presence of Red Spider Mite in garden roses is one of the major disease related problems during the dry and hot summer months. This pest is favored by hot and dry conditions. They fed usually on the underside of leaves by means of sucking mouthparts. The eggs and mites are covered with a delicate web, which protects them from contact sprays. In recent years Red Spider Mite has become a major problem in our nurseries. For control of Red Spider Mite it is very important to understand the life cycle of the spider.

Life cycle

Egg – larva – nymph – adult

Up to 20 – 30 short cycles per year are possible under dry and hot conditions. Under ideal conditions this cycle can be as short as 8 – 12 days. Important is the fact that 75% of the adults are females and that one female can give rise to millions of spiders within a few months.

Control of Red Spider Mite during dry and hot conditions

When controlling Red Spider Mite the following must be taken into consideration:

§ Red Spider Mites can become resistant to pesticides and pesticides must be varied frequently.

§ Pesticides used for different parts of the life cycle must be used alternatively during different spraying sessions.

§ Keep the humidity high during hot periods. (Wet the soil surface).

§ Spray on the underside of the leaves and use small droplets for effective coverage.

Special mix for mites:

 

Biomectin
Gallic oil or Canola oil
Latron B or any sticker/wetter

6ml per 10-liter water.
15ml per 10-liter water.
1ml per 10-liter water.

Posted in: