We were on a journey, and Ibn Umar was with us, so I asked him, and he said, "I saw the Messenger of Allah ﷺ not perform any voluntary prayer during travel, neither before the obligatory prayer nor after it."He said, "I also asked Ibn Umar about selling fruits, and he said, 'The Messenger of Allah ﷺ forbade selling fruits until the blight has passed.'"I asked, "Abu Abdul-Rahman, when does the blight pass, and what is the blight?"He replied, "The rising of the Pleiades."
كنا في سفر، ومعنا ابن عمر، فسألته، فقال: رأيت رسول الله ﷺ لا يسبح في السفر قبل الصلاة، ولا بعدها قال: وسألت ابن عمر عن بيع الثمار، فقال نهي رسول الله ﷺ عن بيع الثمار حتى تذهب العاهة. قلت: يا أبا عبد الرحمن، وما تذهب العاهة؟ وما العاهة؟ قال: طلوع الثريا.
Imam Ahmad (5012, 5015), Tabarani in al-Kabir (13287), and Bayhaqi (5/300) all narrated it through Ibn Abu Dhib, from Uthman bin Abdullah bin Suraqa, who mentioned it. Its isnad is sahih. His statement, "the rising of the Pleiades," is a sign that the danger of fruit blight has passed, and something similar will come from Zayd bin Thabit.