It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) forbade the sale of fruits until the blight (the danger of disease) has passed. Ibn Suraqah asked: "When is that, O Abu Abd al-Rahman?" He said: "When the Pleiades (cluster of stars) rise."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 13230