What Does It Mean if My Pineapple Leaves Are Turning Yellow?

Zinc Deficiencies

• Zinc deficiency causes a condition known as crookneck, which is categorized by leaves that have deformed and grown waxy and brittle. The leaves also turn a light yellow due to this condition. The yellowness begins as small spots that turn into blisters that become brown and sunken. Treatment for this condition consists of a solution of 1 percent zinc sulfate. However, application should be applied with caution, as too much zinc sulfate could kill the healthy leaves on the plants.

Yellow Spot Virus

• The disease yellow spot virus is transmitted by onion thrips and while it normally attacks members of the allium family, such as garlic and onions, it also attacks pineapples. The disease causes yellow stripping to appear on the leaves of infected pineapples. The only known treatment is to control the thrips that caused the disease. The best way to control them is by using insecticidal soap every couple of days. The soap should be applied to all plants in the surrounding garden since the pests like to travel from plant to plant.

Transplant Shock

• Pineapples require transplanting each year in order to keep the soil clean and fresh. However, a pineapple's root system is easily damaged. The shock of the move causes the leaves to yellow and die. This condition typically goes away a few days after it loses a few leaves. You can help the plant long by giving it an application of the vitamin B-12.

Humidity and Temperature

• Pineapples require humidity and high temperatures to grow healthy and strong. If the pineapples are indoors, you can use a humidifier in the room to keep the leaves moist. If they dry out, it causes the tips of the leaves to yellow. The temperature needs to stay around 70 degrees Fahrenheit or hotter, anything colder causes the leaves to yellow. It is best to keep pineapples away from windows when it starts to get colder outside.