Cover crops: Controlling pests at multiple trophic levels Peter L. - - PowerPoint PPT Presentation

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Mar 01, 2024 447 likes •680 views

Cover crops: Controlling pests at multiple trophic levels Peter L. Coffey, Guihua Chen, and Cerruti R.R. Hooks Clover-Rye Clover Fallow Clover-Rye Fallow Clover Clover Clover-Rye Fallow Clover Fallow Clover-Rye 80 Adult beetles

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Cover crops: Controlling pests at multiple trophic levels

Peter L. Coffey, Guihua Chen, and Cerruti R.R. Hooks

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Clover-Rye Clover Fallow Fallow Clover Clover Fallow Clover-Rye Clover-Rye Clover Fallow Clover-Rye

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10 20 30 40 50 60 70 80 17-Jun 25-Jun 2-Jul 10-Jul 17-Jul 24-Jul 31-Jul 7-Aug

Mean Adults / Plot

Clover Fallow Clover-Rye

Adult beetles arrived later in the clover-rye treatment, but persisted longer.

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10 20 30 40 50 60 70 80 90 17-Jun 25-Jun 2-Jul 10-Jul 17-Jul 24-Jul 31-Jul 7-Aug

Mean Egg Masses / Plot

Clover Fallow Clover-Rye

There were more egg masses in the clover-rye treatment.

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50 100 150 200 250 300 350 400 450 500 17-Jun 25-Jun 2-Jul 10-Jul 17-Jul 24-Jul 31-Jul 7-Aug

Mean Larvae / Plot

Clover Fallow Clover-Rye

There were more larvae in the clover-rye treatment late in the season.

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5 10 15 20 25 30 35 17-Jul 24-Jul 31-Jul 7-Aug

Mean Stink Bugs / Plot (n)

Clover Fallow Mix

Adult and nymph numbers were not affected by cover crop treatment.

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2 4 6 8 10 12 14 16 Clover Clover-Rye Fallow

Mean Stink Bugs / Plot (n)

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There were fewer spined soldier bug egg masses in the clover-rye treatment.

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0% 5% 10% 15% 20% 25% Clover Fallow Mix

Successfully Hatching Spined Soldier Bug Eggs

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The spined soldier bug eggs laid in the clover-rye treatment did not survive.

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0% 10% 20% 30% 40% 50% Clover Fallow Clover-Rye Percent of Spined Soldier Bug Eggs Parasitized

Parasitism rate was not measurably affected by treatment

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Identification of parasitoids reared from all egg masses will allow us to compare parasite populations

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2000 4000 6000 8000 10000 12000 14000 Clover Clover-Rye Fallow

Mean Kg Marketable Eggplant / ha

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There was significantly more marketable fruit in the clover treatment

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The clover-rye mix underperformed the clover alone, and had higher

pest numbers.

Predators avoided ovipositing in the clover-rye mix, and failed to

hatch when they did.

Ongoing research is investigating if the cover crop treatments may be

altering the parasitoid population in the field.

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