The genus Hoya or wax plant consists of over 200 species . The leaves and flowers are deal in a waxy center , give the plant its name . The leave are green and the flowers are take in creams , pinks , purple or whites . The wax plant can be a houseplant , perennial or shrub . Wax plant life bloom betimes to mid - summer in USDA hardiness zones 10 and 11 . Like most works , the hoya has problems with disease and pestilence .
Botrytis Blight
Botrytis blight is a fungus that causes grayish field on leaves . The snapper leave are more oftentimes infect as moisture levels are the highest there . The leave-taking crumple and flex mushy and the spore , or reproductive cells of the fungus , can be easy realize with a magnifying glass . The disease occurs more often in cool , lower lightheaded periods of the year .
The near defence is to manage by review and skilful hygiene . Remove and dispose of faded or blighted flowers , leave of absence , or entire plants straight off .
Stem and Root Rot
This disease on a hoya can go unnoticed until the symptoms are quite far along . The waxy substance on the hoya industrial plant can help retard down the wilt in the plant ’s leaves even as the stem die . Eventually , the roots will turn gray to melanize and can be soppy or dry .
The best control for this disease is to contract lachrymation of suspected infected plants . Fungicides may also help if the contagion is serious , but it is important to identify exactly which fungus is responsible for the ancestor rotting . A better option is to replant the hoya in a sweet pot mass medium , if possible .
Aphids
Aphids are soft - bodied bug . The aphid most often seen on wax plant is the rose bay aphid . Infestation occurs rapidly and can go unnoticed until the honeydew left from where the aphid suck on the plant juice is discovered .
Control is relatively easy with basic aphid insecticides found in your local garden center .
Fungus Gnats
Fungus gnats are modest black fly ball that are find on the soil surface or on the parting . Their larvae live in the stain and cause damage by eating the roots of the flora . This can predispose the plant to many other disease . Once the gnat are discovered , soil drenching and soil - surface insecticide sprays are effective at master the larvae .
Mites
Mites are so small they can go undetected until the plant become badly discredited . The initial symptoms include new leaves cupping downwardly , puckering and stunted outgrowth . Prevent the plague from come about in the first berth . If that has failed , the important point of control condition is total reporting with a pesticide .
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