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How to Manage Pests

Pests in Gardens and Landscapes

Identification and confirmation—Nutrient disorders

Symptoms of common nutrient and mineral disorders.

Foliage damage from excess ammonium
 Excess ammonium in poinsettia
Spindly growth and pale; downward cupping leaf margins

Damage due to excess boron
Excess boron in chrysanthemum
Chlorotic or purplish to brown marginal necrosis or spotting of leaves.  Foliage may be dry or papery		 Damage caused by excess manganese
 Manganese toxicity in chrysanthemum
Stunted, chlorotic younger leaves.  Necrotic spots between veins
Foliage damage by excess sodium chloride
 Excess sodium in poinsettia
Marginal leaf necrosis		 Foliage damage due to boron deficiency
 Boron-deficient poinsettia
Chlorosis progressing to necrosis along margins of older leaves.  Slight necrosis of leaf veins or chlorotic leaf spots		 Foliage damage due to nitrogen deficiency
 Nitrogen-deficient chrysanthemum
Leaves pale green to yellowish overall.  Commonly appears first on older leaves

Iron-deficient gardenia leaves
 Iron-deficient gardenia
Interveinal chlorosis.  Entire leaf may turn yellow or white, except for the veins

 Foliage damage to gerbera leaves
 Iron-deficient gerbera
Interveinal chlorosis.  Entire leaf may turn yellow or white, except for the veins
 Phosphorus deficient leaves
Phosphorus-deficient poinsettia
Foliage yellowish, reddish, or purplish, especially on older leaves.

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