Iranian Pistachio Association – Horticulture Committee: With a sudden increase in temperature in early spring, pistachio trees are exposed to early heat stress.
These conditions, as they will have a direct impact on next year’s crop, may reduce the supply of produce by farmers.
The most sensitive growth stage of the pistachio tree is the time of flowering and pollination. This phenomenon during pollination may lead to drying of the stigma surface of the female flower and ultimately cause incomplete clustering, flower and bud shedding. In addition, the increase in temperature at the beginning of the season will also affect the number of flower buds next year. The increase in temperature may also cause the growth of buds to stop in trees that are in the bud swelling and bee bottom stage (especially the Akbari variety).
It should be noted that due to rising temperatures, there is also a possibility of pest outbreaks.
