Prevention and treatment of iron deficiency chlorosis in gardenia

Distribution: calcareous soil is easy to occur.

Symptoms: leaf chlorosis, first occurs on the tender leaves at the end of the branch, starts from the edge of the leaf, develops to the center of the leaf, the leaf color changes from green to yellow, gradually aggravates, the mesophyll becomes yellow or light yellow, but the vein is still green; then the whole leaf turns yellow, and then yellowish white and white, the edge of the leaf appears grayish brown to brown, necrotic and dry. For the whole plant, the top leaves suffered the most, the lower leaves were normal or close to normal, and the disease was serious, the plant weakened year by year, and finally died.

Pathogen: the disease is caused by unsuitable cultivation conditions, such as too sticky soil, too much limestone, heavy alkalinity, low-lying moisture, insufficient supply of iron, etc., which is an important physiological disease.

Prevention and control methods:

1, horticultural control: to use well-drained, soft, fertile acid soil cultivation, pot planting can use mud and other acid soil, every 1-2 years to change the basin soil; the use of organic fertilizer, mixed with ferrous acid and zinc sulfate in organic fertilizer retting.

2. Chemical control: at the initial stage of the disease, diseased plants were irrigated with 2% Mel 3 ferrous sulfate, or 0.1%-0.2% ferrous sulfate was sprayed on leaves, or iron was used in the soil, 22 cm (6 inch) flowerpot 0.2 grams. The treatment of chlorosis with drugs should be carried out at the initial stage of the disease, otherwise the effect is poor.

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