Malformed fruit incidence in greenhouse strawberries caused by young pistil injury from flower visiting of honey bees before full bloom and use of blowfly Lucilia sericata as a pollinator
2019
Nishimoto, T. | Minami, D. | Yasuakawa, H. | Horikawa, D. | Toui, K. | Yaoku, Y. | Sato, T. | Yoshida, Y.
In a greenhouse where honey bees had been released, we confirmed that honey bees often visit breaking buds of strawberry 'Asukarubi' and 'Kumaken-I-548' and injure young immature pistils. Such flowers consequently developed into malformed fruits. When honey bee bud-visitation was disturbed by covering until full bloom in the same greenhouse, the malformed fruit incidence was decreased considerably. When 300 Lucilia sericata pupae were applied weekly in a 130-square m greenhouse growing 'Asukarubi', 'Fukuoka S 6', 'Kaorino', 'Kotoka', 'Kumaken-I-548', 'Marihime', 'Nyoho', 'Oishi berry', 'Sachinoka', and 'Yumenoka', the pollination efficiency was comparable to that of the honey bee, but malformed fruit incidence was lower in all cultivars than that in same-sized greenhouses in which honey bees had been released.
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