Powdery Mildew

Background:

Powdery mildew is a common fungal disease of many different plants and crops. There are many different species of powdery mildew and each is specific to certain plant species. However, they are all distinctive in the way they cause a fibrous white or yellow growth more commonly to the upper surface of leaves, shoots, flowers and sometimes fruits and pods. An infestation usually begins as powdery white dots that gradually increase in size to cover the whole area (Fig. 1.). Powdery mildews occur more often under dry, warm conditions and therefore are commonly found on many glasshouse crops during the summer months, particularly where there is little air movement. Certain species of powdery mildew can remain as dormant spores on weed plants throughout the winter. These can then re-infest susceptible plants and crops when they are grown in the spring and summer months.

Using SB Plant Invigorator to control Powdery Mildew:

Independent research studies have shown that SBPI can be highly effective at controlling Powdery Mildew if used correctly.

SBPI has a non-chemical, non-biological action against powdery mildew and appears to control the disease by physically removing active mildew spores from a leaf surface.

To achieve control, thorough and regular applications of SBPI applied to the whole plant and to the point of run-off are required.

Both upper and lower surfaces of leaves must be treated.

These regular applications of SBPI have been shown to prevent powdery mildew becoming established on susceptible plants, in particular Brassica (Figs. 1 & 2).

An established infestation of powdery mildew can also be controlled by regular applications of SBPI although damage caused by a severe infestation may still remain visible on older leaves.

Spraying as often as weekly may seem excessive but please remember SBPI provides foliar nutrients, comprehensive pesticide and mildewcide all at the same time.

Most people who use SBPI weekly rarely have to use other products. Resistance to SBPI will not occur due to its physical mode of action.