Iron deficiency (chlorosis) is a very common deficiency in blueberries. It is first exhibited by younger leaves and spreads to the entire shoot. Yellowing occurs between veins, while veins remain green. Leaves may turn completely yellow or, in severe cases, reddish-brown. Blueberry plants are not able to remove iron from a high pH soil. Iron is much more available at a lower soil pH. To correct iron deficiency, apply iron chelate to the soil or to the leaves. The more permanent and less expensive solution is to lower the soil pH with sulfur to the recommended soil pH of 4.2 to 5.2. Manganese toxicity can occur when soil pH is too low or too much acidifying material has been used. Symptoms are similar to those of iron deficiency. A foliar analysis may be needed to determine the problem.