Cereal forage for dairy cattle
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چکیده
represents considerable thrips pressure. We present the data from yellow traps only to show that many thrips were present in the greenhouse throughout the trial. In the absence of predators, the number of thrips per plant increased consistently throughout the trial to reach 39.28 per plant in the final week (table 1). All treatments significantly reduced thrips numbers (P < 0.05) compared to the control. In almost no case except on day 17 did we find a signhcant difference between treatments with predators alone or with predators and pollen. On day 17, treatments with A. barkeri alone and with pollen were inferior to those with A. cucumeris. Amblyseius barkerimay not do well at low prey densities, and that could explain its poor perfomnce on day 17. On subsequent dates, as thrips densities increased on plants, the performance of A. barkeriwascomparable tothatofd. cucumeris.
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