Daytime temperatures over 30 C and/or nighttime temperatures over 20 C during flowering have a large impact on the snap bean crop. High temperatures cause flower buds and flowers to drop off prior to pollination. They may also result in the abortion of young pods and in poor seed development. Beans are most susceptible to high temperature stress from early bloom to 2 cm pods. As a result, we often see a split set, where the lower (older) pods survive and a new flush of pods occurs when cooler temperatures return.
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