Dormant oil to harvest — a spray-timing guide built around New England's actual growing season.
Apple, pear, peach/nectarine, cherry, or plum — each has a different bloom window and pest pressure.
Northern New England (Zone 3–4) runs 1–2 weeks behind Southern New England (Zone 5–6). This shifts every stage.
The calculator finds where today falls in the dormant → bloom → cover spray → harvest sequence and shows what to do now.
The full timeline below shows every upcoming spray window so you're never caught off guard by a warm week.
This calendar reflects a general home-orchard IPM (integrated pest management) approach — spraying preventatively at key vulnerability windows rather than on a rigid weekly schedule. Backyard trees with good sanitation, thinning, and resistant varieties often need less than a commercial program.
Never spray anything during bloom while pollinators are active — this protects bees and is required by law for many products. Always respect the pre-harvest interval (PHI) listed for each product before picking.
Organic options (Spinosad, copper, sulfur, horticultural oil, Bt) are noted alongside conventional options where they exist. Always read the label of the specific product you buy — rates and PHI vary by formulation.