Orchid Pests and Diseases

Pest: Mealybugs on orchids | How To Get Rid of Mealybugs on Orchids? | Series 9

Posted by Team Orchid-Tree on

Mealybugs and Scales are probably the most common insect pest after scales on orchids. Mealybugs can cause loss of leaves, buds and flowers through their feeding and also weaken the plants. In addition, mealybugs create large amounts of honeydew which make plant parts sticky, attracts ants, and provides a substrate for sooty mold.  SYMPTOMS  At first glance, it looks as though the plant has some sort of cottony white fluffy mass on its leaves. Closer examination reveals a wingless insect that is feeding on the plant's tissue. They can seemingly appear out of nowhere and quickly spread across an entire plant...

Read more →

Pest: Scales on Orchids | How to get rid of orchid scales? | Series 8

Posted by Team Orchid-Tree on

Scales are probably the most common insect pest on orchids. There are at least 27 species of scale identified. They are classified as soft scale and hard scale. Fortunately, the hard scale is rarer on orchids but can be identified by its hard brown domes of the adult female. SYMPTOMS Soft scale damages the plant by sucking sap from the plant. It also leaves behind a sticky excretion called honeydew. The hard scale does not leave this excretion. A large infestation of males will appear powdery and white. Adult females create larger scales that protect eggs.  Soft scale can be found along the underside of leaves,...

Read more →

Bacterial Diseases: Bacterial Brown Spot | Series 7

Posted by Team Orchid-Tree on

SYMPTOMS The symptoms may appear anywhere on the leaf as a small, soft, water-soaked blister. Initially light or yellowish-brown or lighter green in colour, the infected spot enlarges, coalesces and eventually becomes brown or black, dried up and sunken. It oozes bacteria-laden liquid, particularly when the disease reaches the tip of the leaf. If the diseased area invades the crown, the plant will die. It is most prevalent during the warmer weather.      TREATMENT Treatment of all fungal or bacterial diseases starts with the following: Isolate the plant from other plants in your collection. Remove or Cut all the infected leaves/canes/roots...

Read more →

Bacterial Diseases: Bacterial Soft & Brown Rot caused by Erwinia | Series 6

Posted by Team Orchid-Tree on

SYMPTOMS Typical symptoms were soft rots characterized by moist and watery decay of the one or whole leaves, which initiated as small water-soaked lesions and enlarged rapidly to the entire leaves. If unchecked, the infection will rapidly rot the leaves and roots and spread more slowly into the rhizomes or pseudobulbs. This wet rot may have a foul odour and has a water-soaked appearance. The bacteria are opportunistic organisms that can enter through wounds.  TREATMENT Treatment of all fungal or bacterial diseases starts with the following: Isolate the plant from other plants in your collection. Remove or Cut all the infected...

Read more →

Fungal Diseases: Fusarium Wilt | Series 5

Posted by Team Orchid-Tree on

SYMPTOMS Major causes for Fusarium are high salt content in the irrigation water and potting medium kept too moist for too long. Roots begin to rot and the base of the plant develops a back dry rot. The disease is spread to improper hygiene, generally as a result of using nonsterile cutting tools, which transfers the fungus from plant to plant. The infected plant leaves will appear shrivelled, wrinkled or wilted and will eventually die. On Phalaenopsis you may observe sunken spots on the leaves and will form yellow streaks, older leaves become leathery and younger leaves may become reddish.   ...

Read more →