Using Mass Trapping in a Thrips IPM program Ashley Summerfield
Mass Trapping • Sticky cards , tape or trap plants • Easy to implement • Inexpensive • Mass trapping is most effective for dispersing thrips – Entry points • Every thrips caught = big impact on future population
Sticky Cards • Small cards excellent monitoring tool • Larger cards & tape for mass trapping • Cards & tape can be equally effective
Sticky Cards • Thrips are poor fliers • Do not put cards too high above crop • Put some cards under benches • Examine sticky cards weekly to assess pest numbers • Mass trapping cards/tape can be left up for several weeks
Sticky Cards • Both yellow and blue sticky cards are equally attractive to thrips • Yellow is attractive to many species; • can also be used to mass ‐ trap whiteflies, fungus gnats & shore flies • Blue is more specific to thrips • less attractive to other species • Use blue to avoid trapping flying beneficials • Avoid blue when using bumblebees
Sticky Cards • New patterned sticky roll “Optiroll Super” • Developed by BioPol Natural (Netherlands) & Russel IPM (UK) • Greenhouse trials in South America reported blue Optiroll substantially increased thrips captures • Already being used in Ontario
Trap Plants • Yellow mums & marigolds • Adult thrips prefer plants with flowers • Attractiveness of flowers is influenced by • Volatiles ● Pollen • Colour ● Nutritional value • May be used as banker plants • Replace trap plants weekly
Trap Plants Number of thrips per Trap plant Crop plant Plante piège Culture 600 • Adult thrips are 500 significantly more 400 plant 300 attracted to flowering 200 trap plants than non ‐ 100 flowering crop 0 Vegetative Buds Crack ‐ bud • Trap plants more Number of thrips 70 b effective while adults 60 per plant 50 a are dispersing 40 A 30 20 B 10 0 Dispersing Resident
Trap plants Trap plants effectively reduce thrips population in • crop in commercial setting 4 Number of WFT adults Control 3 Trap plants 2 1 0 0 1 2 3 4 Week
Trap Plants Trap placement • Interspersed pattern better than barrier pattern • Increase concentration of trap plants near entry points > Interspersed Barrier
Thrips lures neryl ‐ S ‐ 2 ‐ methylbutanoate (Thripline ams, Syngenta Bioline) • Thrips aggregation pheromone • Marketed as a monitoring tool • Improve mass trapping? • Improve biocontrol? • Agitating thrips (more contact) • Attracting predators
Thrips lures Research at Vineland Does the addition of thrips semiochemicals improve efficacy of mass trapping by sticky cards and trap plants?
Thrips lures Research at Vineland More thrips caught on trap plants with • 350 lures Sticky card + lure Mean adult thrips/card 300 Sticky card More thrips caught on sticky cards with • 250 lures 200 150 Both sticky cards and trap plants more • 100 effective with lures 50 Trap plants more effective than sticky • 0 1 2 3 cards Week # 250 200 Control % population increase of Mean adult thrips/trap Trap plant + lure 200 Sticky cards Trap plant 150 Sticky cards + lure 150 Trap plants plant 100 100 larvae Trap plants + lure 50 50 0 0 1 2 3 -50 Week # -100 0 1 2 3 Week #
Thrips lures • Similar results found by two independent research groups in strawberries (UK) & roses (Australia) • Commercial trials, natural thrips pressure Sampson & Kirk, 2013 Broughton et al., 2015
Conclusions • Mass trapping a useful tool in thrips IPM toolkit • Sticky Cards • Pros: low maintenance, kills thrips, versatile, useful for multiple pests • Cons: may also catch flying bios • Trap Plants • Pros: more attractive to thrips, will not kill flying bios, may be used as banker • Cons: higher maintenance than cards • Optimize both methods with proper placement & addition of lures
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