272 Chemical-thinning Asian Pears

in HortScience
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  • 1King George County Cooperative Extension, King George, VA 22485; 2Dept. of Horticulture, Virginia Tech, Blacksburg, VA 24061

Asian pears bloom profusely and require early hand-thinning to produce large saleable fruit. In 1998, `Shinko' and `Hosui' trees were sprayed with Accel, Ethrel, NAA or carbaryl when average fruit diameter was ≈9 mm. Superior oil was added to all treatments at the rate of 2.5 mL/L. Fruit set was reduced 40 to 70% by Accel at 84 ppm and ethephon at 678 ppm, but NAA at 8 ppm and carbaryl were less effective. In 1999, Accel was applied at a range of 0 to 105 ppm and ethephon was applied at a range of 0 to 678 ppm. All treatments contained carbaryl and oil. Fruit set/100 flower clusters declined linearly with increasing ethephon concentration on `Shinko', but was not tested on `Hosui'. Fruit/100 blossom clusters declined linearly with increasing Accel concentration on `Shinko'. On `Hosui' Accel reduced fruit set by more than 40%, but treatments did not differ significantly (5% level) from the control. In both years `Shinko' was easier to thin than `Hosui'.

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