IPM pest calendar — Utah — print version.
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SUS Farms · Utah Gardening
IPM pest calendar — Utah
pests · intermediate · ~7 min read
Integrated Pest Management starts with knowing which pests show up which week, so you can scout before damage and use the lightest tool that works. The list below is built from USU's IPM Pest Advisory plus our own field journals.
March — pre-emergent
Hang codling-moth pheromone traps in apples and pears the second week of March. When traps catch >5 moths in 2 days, time the spray window from biofix. Spray dormant-oil on stone fruit if scale or mites were a problem last year.
April — aphids and slugs
Aphid colonies form on the underside of new growth. Blast off with water before chemicals. Release lacewings or ladybugs if available. Cherry slug starts skeletonizing leaves — handpick or wash off.
May — beetles
Floating row cover on cucurbits and eggplants until flowering blocks both cucumber beetle and flea beetle. Trap crops can divert pressure away from main crops.
June–July — squash bugs and mites
Hand-pick squash bug egg masses every other day. Spider mites explode in heat — daily misting on leaf undersides keeps them down without chemicals. Bt for tomato hornworms.
August–October — late blight, voles
In wet years, late blight on tomatoes spreads from low leaves up — remove infected leaves, water at base only, harvest green if forecast turns. Vole damage starts in October; clear weeds from tree bases.