Thrips populations in a rose crop as monitored by sticky cards in the vent opening peaked on the 22nd of September at 105 thrips per sticky card per vent.

Thrips populations in a rose crop as monitored by sticky cards in the greenhouse closer to the vents peaked on the 24th of September at 80 thrips per sticky card per vent

Thrips populations in a rose crop as monitored by sticky cards in the greenhouse away from the vents remained fairly constant. It was highest on the 11th of August with about 18 thrips per sticky cards per vent.