Step 1
Pests including aphid , scales , whitefly , thrip and lacebugs are common on Arthur Stanley Jefferson Laurel shrubs . While some insects sap essential succus from the leaves , causing them to change by reversal lily-livered and fell prematurely , others secrete steamy honeydew melon that not only attracts emmet but also serves as the breeding ground for sooty mildew fungus . Damaged shrubs become susceptible to a number of diseases including folio spots . Inspect your laurel shrub frequently and take prompt action against pests . Spray a honey oil of urine from a hose over infestations , or regale infested leaves with neem oil colour or horticultural oil . Alternatively , spray a broken - toxicity herbicide over large plague . Read recording label directions beforehand for administration rate and precautions .
Step 2
Soil Conditions
Improper land conditions also cause yellowing leaves on a bay wreath . Laurel shrubs thrive in well - draining , acidic soils . The bush plant in poorly draining or alkaline soils develop greensickness , a nutrient deficiency that causes fond or complete yellowing of leaf . Amend the dirt with aluminium sulphate to provide the plant indispensable nutrient . Test the soil ’s existing pH to determine the amount of ammonium ion sulphate needed to correct the problem . If the intervention does not amend yellowing leafage , refer your county cooperative extension agent for additional bakshis regarding additional micro - food lack in the soil . annul over - watering the plant or causing its roots to stand in pool of water for prolong periods .
Diseases
Fungal disease responsible for for yellowing laurel leaf mostly occur in bounce , during cool , warm and moist weather condition . Leaf spots and tooth root rot are common disease in laurel shrubs that cause yellowed foliage . The fungal spores of the disease overwinter in the debris at the base of the plant and disperse through irrigation and rain water supply . To care for the septic laurel plant , prune damaged role with sterilized pruning shears and discard plant clippings and dust from around its base . use a registered antimycotic to control spread .
Other Factors
Excessive sunlight burns the leaf of a laurel bush , causing it to yellow before turn Robert Brown . Install a shade material to provide the bush dappled afternoon sun , particularly in U.S. Hardiness Zones 5 through 9 . Over - fertilizing also causes the foliation to turn lily-livered . Excessive fertilizer burn the roots of the industrial plant , causing its foliage to flex white-livered . Ideally , the plant do good from one plant food applications programme every bounce , before new emergence . Feed it a plant food specifically explicate for acid - loving plants , following label directions for dosage rate . Space the fertilizer from the wood to forestall burning , and irrigate the soil deeply after the program .
References
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