Spider Mites

Typical spider mite http://en.wikipedia.org/wiki/Spider_mite

Typical spider mite webbing

Spider mite populations are a particular problem in the glasshouse environment. These tiny arachnids, measuring less than 1 mm in size, feed on the underside of plant leaves causing mechanical injury that is characterised by the appearance of yellow or white flecking, bronzing and scorching of leaves and leading to plant stress, or in the worst cases plant death can occur. The use of insecticides against spider mites often causes resistance and kills important natural spider mite predators. Spider mite control requires IPM strategies.

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The most common glasshouse spider mite pest is Tetranychus urticae, commonly known as the glasshouse red spider mite or two-spotted spider mite, which commonly affects glasshouse crops of tomatoes, cucumbers, melons, beans and peppers. Another economically important spider mite pest is the red spider mite, Panonychus ulmi, also known as the European red mite, which resides on apple, pear and plum trees in almost all fruit-growing regions of the world.

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Eden Research products have several advantages over existing management strategies:

  • The risk of resistance is predicted to be low due to the nature of the active ingredients
  • Eden products appear to have minimal impact on biological control agents
  • Eden products are not phytotoxic
  • It is possible to apply Eden products up to one week before the harvest of food crops
  • Cost-effective product compared to current alternatives

Eden Research and Development - Spider mite trials

An independent efficacy testing service provided by i2LResearch Ltd (Cardiff) is currently screening a number of different Eden products in bioassays against both the two-spotted spider mite (TSSM) T. urticae, and the fruit tree red spider mite (RSM) P. ulmi. Preliminary results indicated that Eden products H2Y-31 and 3GY-115 were highly effective against TSSMs when used at 500 ppm, and Eden products H2Y-11 and H2Y-13 showed good control against RSMs at the same dose rate (see Figure 1).

Figure 1. Efficacy against spider mites: Eden products at 500 ppm

Figure 1. Efficacy against spider mites: Eden products at 500 ppm

TSSM - Two-spotted spider mite (T. urticae)
RSM - Red fruit tree spider mite (P. ulmi)

 

Four different Eden products were tested against RSMs, and two products (H2Y 31 and 3GY 115) were used against TSSMs. The competitor product bifenthrin was used at the label rate.

 

 

 

 

 

 

 

Efficacy testing performed by i2LResearch Ltd, 2008

  • Eden products have the potential to provide safe and effective spider mite control on food crops that are grown in the glasshouse environment.
  • The aim of the spider mite research program is to systematically identify the most potent product formulation in small plot replicated field trials on key glasshouse crops based in Southern Europe.

For further detailed information on Eden's products, please contact Eden at info@edenresearch.com