http://www.greenhousecanada.com/content/view/2417/38/
Results showed that a single application of Avid immediately suppressed the broad mite population to close to zero and residual effectiveness was evident for three weeks. A. swirskii was more efficient than N. cucumeris in controlling broad mites, however suppression of broad mite populations did not occur until two weeks after the first predatory mite release.
i cant comment on avid i have never used it, and it looks like i wont need it, still no sign of BM in my rooms
GREENHOUSE TRIALS SHOWED BOTH MITES WERE EFFECTIVE
■ In the greenhouse trial on begonias, A. swirskii was compared to N. cucumeris and a non-treated control (Figure 2b). Both predatory mites were equally effective at controlling broad mite infestations to almost zero within one week of release. After two weeks, no broad mite eggs, immatures or adults were found in the A. swirskii and N. cucumeris treatments. Two weeks after the first release, the predatory mites even spread to the control plots and started suppressing the broad mites there too. The predatory mites were reproducing on the plants as eggs were observed in many samples.
At the end of the trial, control plants showed significantly more damage than plants in the predatory mite treatments. However, while pest suppression of broad mites was very rapid, there was still some damage of the treated plants.
A preventive control program against broad mites is advisable to minimize crop damage, especially because broad mites are difficult to detect in a crop and are often only noticed when damage appears, at which point populations can be very high and spread out through the crop.
An IPM program for broad mites in vegetable and ornamental greenhouse crops (e.g., sweet peppers, impatiens and begonias), emphasizing biological control with the predatory mites A. swirskii or N. cucumeris appears to have substantial potential based on the results of our studies. ■
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