Give thrips to the slip

Pest control management guidelines in orchards and greenhouses n most indoor/outdoor plants

pest control pic.jpg

A common pest found in greenhouses and indoor/ outdoor plants, thrips damage plants by puncturing the epidermal layer of fruits, flowers and leaves, and sucking out the cell contents. Here’s how to prevent these tiny menaces from ruining your harvest.

Fast facts

1. Monitor blocks throughout the season for the presence of thrips – commence monitoring 2-3 weeks before flowering
2. Ensure timely applications of Delegate™ 250WG as indicated on the label
3. Ensure that the product is mixed into the spraying solution—make a premix to ensure that granules dissolve
4.Do not mix into muddy water
5.Ensure that the spraying solution’s pH is between 5 and 8
6. Remove/treat external sources of infestation eg. flowering weeds and flowering lucerne fields—do not disturb flowering weeds during grapevine flowering-period
7. Ensure adequate coverage – high volume application

Timing of application

Continuous monitoring results will indicate when the product should be applied. Thrips numbers are known to peak at the onset of flowering and continue to be high until fruit set and product application is therefore recommend to be at the onset of flowering (80% cap fall), ensuring fruit protection.

Depending on the duration of the flowering period or presence of thrips and population-pressure, a follow-up application within 5-7 days of the previous application may be necessary to obtain adequate protection. In some areas under certain conditions thrips are also known to occur later in the season and a later application of the product as described on the product-label may also be necessary to ensure berry protection.

How do we control thrips?

Monitoring-results will indicate when control measures should commence.

Thrips are known to peak at the onset of flowering and sprays should therefore be timed accordingly, starting at or just before 80% cap fall will ensure that fruit are protected till fruitset. Control measures should be based on sound Integrated Pest Management principles, including cultural practices (such as not disturbing cover crops at the onset of flowering till two weeks post-flowering to prevent an external source of infestation) and it should be combined with the use of registered insecticides, as described below.

There is no set economic threshold for thrips. The general recommendation is that control should commence as soon as monitoring methods indicate the presence of thrips, considering label recommendations and withholding periods.

What is Delegate?

Delegate™ 250WG (spinetoram) is a product developed by Dow AgroSciences. The product is effective against certain insects and registered for the control of thrips in commercial vineyards.

Mode of action

Delegate™ 250WG is a water dispersible granule with contact and stomach action, of which ingestion has proven to be the most effective.

Optimal plant tissue coverage is therefore of utmost importance (high volume application). The product is not systemic but will be absorbed by the cuticle of plants and has translaminar action, thus penetrating the leaves, which is proven advantage for thrips-management as they are known to feed in this area.

Do not apply Delegate™ 250WG in more than two consecutive applications or more than three applications/season/block.


For more information please contact the registration holder: Dow AgroSciences Southern Africa (Pty) Ltd. on Paarl (021) 860 3620 • Pretoria (012) 361 8112 • Emergency No. 082 887 8079

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Issue 45


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