Aphid Myzus persicae difficult to control in sweet pepper

This growing season, pepper growers have been bothered by the peach aphid in their crops very early on. Several samples of the aphids have been received by Biobest, Koppert and Royal Brinkman. It has been established that it concerns the green peach aphid Myzus persicae. However, this type of aphid appears to be less sensitive to the aphidicides and is therefore difficult to control, writes Jeannette Vriend of Glastuinbouw Nederland in the article below, with the cooperation and input of the above companies.

Because of this lesser sensitivity, it is even more important to look carefully at the optimum spraying technique when intervening chemically. After all, small improvements can make a difference. The weather at the time of application also influences the effect of the pesticide. In dark weather and lower 24-hour temperatures, aphids can absorb less active ingredients, so pesticides are less effective. In addition, agents that are absorbed by the aphids must be given time to penetrate the wax layer and not dry too quickly after application. When applying pesticides, be careful for possible damage to the crop, especially in young winter crops.

More pesticides
Scouting is very important, because there can soon be many winged aphids that fly out to find new plants where they will give birth to new live aphids. In this way the aphid plague spreads in no time through the entire greenhouse.

The early deployment of biological beneficials is difficult, because the beneficials are more efficient with longer days and sufficient outside light. The greenhouse temperature is also important, and due to the high gas prices this year, it has often been colder than in other years. The lower efficiency at the beginning of the cultivation can partly be compensated by introducing more beneficials and also by having as wide an arsenal as possible, so that you are not dependent on one or two beneficials. In the beginning, the development of the beneficials is much slower than the development of the aphids. All three companies advise to use sufficient quantities and to repeat the treatment weekly.

The basis of aphid control is formed by Aphidius colemani, Aphidoletes a. and the gall midges. This basis can be expanded with ladybirds (Propylea), hoverflies (Eupeodes and Sphaerophoria) and lacewings. The latter three can eat a lot of aphids in a short time. Be careful, especially with the use of hoverflies and lacewings, that the greenhouse is not filled with yellow sticky traps. If you do, you will find most of your introduced beneficials on them. It is a good idea to plan the extra beneficials in the schedule, so that there are no gaps in the cycle.

Clean finish
With the sunny weather of the last week, growth is well under way. Everyone has concerns about the level of aphids this year. Growers who have already run out of corrective measures are looking at the difficulties that aphids can still cause at the end of the cultivation. It is therefore important to maintain biological aphid control for as long as possible, by using a mix of pesticides, scouting for new hot spots and introducing extra pesticides at those spots. Discuss the cleanest possible aphid exit with your crop protection advisor.

Growers who have not yet completed the aphid survey are urgently requested to do so via this link.

Source: Glastuinbouw Nederlands

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