How does gardenia flower lack iron yellow leaf to do?
distribution
Gardenia iron-deficiency chlorosis occurs easily in calcareous soil and leaves chlorosis and mesophyll turns yellow.
symptoms
Leaf chlorosis occurs first on tender leaves at branch ends, starts from leaf edge, develops towards leaf center, leaf color changes from green to yellow, gradually increases, mesophyll turns yellow or light yellow, but vein is still green, later whole leaf turns yellow, then turns yellow white, white, leaf edge appears taupe to brown, necrosis and dryness. The top leaves of the whole plant suffered the most, the lower leaves were normal or close to normal, and the plants weakened year by year and finally died.
etiology
This disease is caused by unsuitable cultivation conditions, such as soil viscosity, excessive calcareous, alkaline heavy, low-lying wet, insufficient iron supply, etc. It is an important physiological disease.
control methods
1, horticultural control, to use good drainage, soft, fertile acid soil cultivation, potting available mountain mud and other acid soil, every 1~2 years to replace the pot soil once. Organic fertilizer is used. Ferrous acid and zinc sulfate are mixed into the organic fertilizer when it is retting.
2, chemical control, early disease, irrigation of 2%~3% ferrous sulfate, or spraying leaves with 0.1%~0.2% ferrous sulfate, or the use of iron in the soil, 22 cm (6 inch diameter) pot 0.2 g. Treatment of chlorosis with chemicals should be carried out at the early stage of disease occurrence, otherwise the effect will be poor.
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