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Conclusions<br />

- Mulch layer:<br />

● Predatory mites do not establish on crop<br />

● Pest pressure increases gradually<br />

+ mulch layer:<br />

● Increase in pest-pressure is followed by strong increase in predatory<br />

mite density on crop<br />

● Pest pressure decreases<br />

Better predatory mite establishment and thrips-control due<br />

to mulch layer application<br />

Open rearing<br />

units in<br />

cut-roses

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