Spider Mite

The glasshouse spider mite or two spotted spider mite Tetranychus urticaeis is a common pest of protected crops with adult females laying up to 120 eggs in 3 weeks. Motile stages suck the contents out of plant cells and produce characteristic leaf damage of white or silvery speckled patches. 

Almost all protected crops and soft fruit are vulnerable to infestation. 

Type: Small orange/ red predatory mite, has been used for over 45 years. 

How it works: Predator actively hunts and attacks all stages of mites. 

Species controlled: Tetranychus spp. (two spotted spider mite). 

When to use: Can be used on protected edible and ornamental crops as well as outdoor soft fruit. Cannot establish in the absence of spider mites (Tetranychus
 spp.) and performs best in warm, relatively humid conditions but may fail in hot, dry conditions. 

Rates of use: 5 to 10 mites per m2. Some low humidity crops or indoor atria may require twice this rate.

Type: Small predatory mite. 

How it works: Adults and nymphs feed on spider mite eggs, nymphs and some adults. In the absence of mites, they feed on pollen and other prey. 

Species controlled: Fruit tree spider mite (Panonychus ulmi) and glasshouse spider mite (Tetranychus urticae). 

When to use: Suitable to seed a crop as a preventative treatment or when hot, dry conditions prevail. 
This predator is released only under licence for use on glasshouse grown crops, please contact Fargro for further details.

Rates of use: 5-10 per m2 at 2-3 weekly intervals.

Anderline aa (Amblyseius andersoni)
Type: Predatory mite. 

How it works: Predatory mite preys on eggs, larval and adult stages of a range of mite species including glasshouse spider mite, citrus mite, fruit tree spider mite, rust mite and thrips. Able to survive on pollen, fungal spores and plant sap in absence of prey and hence can be applied preventatively. Survives high and low temperature but low humidity limits development. 

Species controlled: Glasshouse spider mite and other spider mite species. 

When to use: Preventatively. The slow release sachets allow release over a 6 week period from a breeding colony. 

Rates of use: One twin sachet per 1 m2


Spider mite on tomato
(Photo: Syngenta Bioline)
Phytoseiulus adult feeding on
two spotted spider mite (Photo: Holt Studios)
Amblyseius californicus adult attacking
two spotted red spider mite (Photo: Holt Studios)