Pear at Petal-fall
See General Recommendations for guidelines on table use. Read all product labels carefully.
Avoid killing bees on blooming cover crops. See Hazards to Bees.
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Codling moth: Many pear growers in Washington use pheromones to help control codling moth. Pheromone dispensers must be in place before the first moth flight, that is prior to bloom. The number of dispenser units per acre will depend on the product used and pest pressure.
Hand-applied dispensers should be placed within the top 2 feet of the tree canopy. It is strongly recommended that full label rate of any hand-applied pheromone dispenser be used. Reducing the rate of hand-applied dispensers per acre can reduce efficacy and result in more damage from codling moth or require the use of more insecticides to achieve acceptable control.
Some pear growers are using aerosol pheromone emitters (CheckMate CM-O Puffer and Isomate CM MIST) to control codling moth. This technology is used at a rate of one pheromone emitter per acre. WSU research has shown that the aerosol emitter technology works as good as a full rate (400 dispensers per acre) of a hand-applied dispenser technology. However, the borders of orchards need to be treated with hand-applied pheromone dispensers to cover gaps resulting from the number of aerosol emitters that are applied per acre.
Grape mealybug: thiamethoxam - PHI depends on rate used. See Hazards to Bees in text.
Leafroller (pandemis and obliquebanded): Each product listed for leafroller control must be consumed by larvae in order to be effective. Therefore good spray coverage of the foliage is critical to achieving good control with these products.
Altacor 35WDG: Altacor is highly effective against leafroller larvae and, at this treatment timing, has the added value of being toxic to codling moth eggs laid on product residues (see recommendations under codling moth). It can therefore be used as part of a management strategy to delay the first larvicide application against codling moth. Use the leafroller models on the WSU Decision Aid System (das.wsu.edu) for the optimum timing for this product.
Belt 4SC: Belt is in the same chemical class as Altacor and is very effective for control of leafroller larvae. However, Belt does not have ovicidal activity against codling moth eggs laid on its residues and therefore cannot be used as part of a strategy to delay the first larvicide treatment for codling moth. Use the leafroller models on the WSU Decision Aid System (das.wsu.edu) for the optimum timing for this product.
Delegate 25WG: Delegate is effective against leafroller larvae. It has a residual activity of 14 days. Delegate is in the same chemical class, that is has the same mode of action, as Success (spinosad).
Bacillus thuringiensis subsp. kurstaki: Bt products should be timed to coincide with periods of warm weather when high temperatures are expected to reach 65 degrees for three consecutive days. Multiple applications are typically required to control high populations.
Esteem 35WP: Esteem should be applied when last stage larvae are present but before pupation has begun.
Intrepid 2F: Some leafroller populations have developed resistance to Intrepid and its use could results in reduced levels of control.
Rimon 0.83EC: Do not apply after petal fall.
Success 2F: Some leafroller populations have developed resistance to spinosad and its use could result in reduced levels of control.
Bull's eye rot: Apply while pear calyx is still upright.
Pear mildew: Rotate fungicides with different modes of action (different chemical groups).
Aprovia: Aprovia and Fontelis are from the same chemical group. Use ONLY one of them for the same growth stage. Do not make more than 4 application per season for fungicides from the same group. Additional restriction may apply, check specefic labels.
Fontelis: Fontelis and Aprovia are from the same chemical group. Use ONLY one of them for the same growth stage. Do not make more than 4 application per season for fungicides from the same group. Additional restriction may apply, check specefic labels.
Sovran 50WG: To limit the potential for development of fungicide resistance, do not make more than four applications of strobilurin fungicides per season. Do not make more than two sequential applications of strobilurin fungicides. This limitation is inclusive to all strobilurin fungicides labeled for use on pome fruits.