Things Needed
rhododendron , like many other flora , are susceptible to a numeral of disease . And most of them are because of fungous infections . These fungi may live in the soil in your yard , or they may have been present on your rhododendron when you purchased it from the nursery . Healthy rhododendrons can resist fungal infestation . But when your plant is weakened by inadequate fear or inclement weather , it becomes susceptible to assault . But before you treat your rhododendron , take a sample of the infection to your local county extension service office or the experts at your local horticulture center for identification . Many flora diseases look alike and you want to ensure that you ’re treating the right one .
Step 1
Cure stem dice - back with strong-growing pruning and fungicide . Stem dice - back is because of the fungi phomopsis and botryosphaeria that also expand in puddled , waterlogged soil . Rhododendron affected with stalk die - back will have one or more limb that short wilt . Rhododendron suffering from the early stages of stem turn dice - back may be saved if all infected or dead tissue paper is pruned promptly and any debris at the base of the plant life is clear off . Cut at least 1 inch into the goodish tissue paper to be sure that you have pruned off all of the fungus . Disinfect your pruning shears with rubbing alcoholic drink and wash them off with water in between each gash . Spray the rhododendron with Subdue or another fungicide pronounce for the discourse of dice - back in rhododendron . If the plant life dies despite your crusade , rear the planting layer before replanting to improve the soil ’s drainage .
Step 2
Cure powdery mildew by lop all of the unnatural tissue paper . Powdery mildew first manifests itself as light dark-green or yellow spots on a rhododendron ’s leaf . As the fungi multiply they will enshroud the leaves in what looks like a powdery coat . peculiarly virulent infections can be sprayed with a antimycotic label to treat powdery mildew like Benlate or Bayleton , but this is seldom necessary .
Step 3
bring around bud blight by prune affected buds . Rhododendron bud attacked by this fungus will turn brown and develop black bristle which are fungous spore . antifungal is not necessary .
Step 4
Cure bloom blight by pruning touched tissue , enlighten leaf litter and spraying with a fungicide prescribed for use on rhododendron that contains benomyl or triadimefon . Rhododendron flowers smite with the flush blight fungus develop waterlogged spots before they become soft , brownish and wilted . To be effective , the fungicide must be sprayed on rhododendron heyday bud as soon as they commence to show color .
Step 5
Cure leaf rust by pruning off the infected leaf . Rhododendron leave bear on with leaf rust develop rust - colored spots .
Tip
Root rot can be due to a number of ground - borne fungus that thrive in puddled , waterlogged soil . unnatural plant life release bass brown at their infrastructure and the coloring will easy move up the plant tissues . But by the fourth dimension the signs are visible it is often too late to economize your plant . You will probably have to uproot the idle rhododendron and plant the new plants in raised beds that cater better drainage . antifungal may be applied to the soil as a preventive measure . However , chemical substance mastery mostly depends on the fungus kingdom responsible for . get through your local county file name extension office and correctly identify the fungus kingdom creditworthy before applying any fungicides .
References
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