The honeydew is a clear substance but at certain visual angles you can see it as a sticky looking residual. Honeydew is shiny and sticky and is a medium for sooty mold growth which will inhibit photosynthesis. Insects reproduce quickly and will invade other plants, carrying any disease from plant to plant. Gray Mold or Grey Mould is caused by airborne fungal that lands on damaged or dying tissue. Why do we need this? All plants have different requirements and if you aren't sure what these are, be sure to check out our Plant Hub to find out what balance and care your particular plant needs to thrive. Black or discolored rotten patches at the base of the plant. In any event you should carefully remove the infected leaves and try not to shake or knock the Rust spores from the discs as this will just spread the infection to other parts of the same plant or close neighbors. They commonly occur on cacti and succulents, coleus, poinsettia, African violets, and gardenia. These insects can be just as voracious as their outdoor counterparts but have the added benefit of developing and reproducing in near ideal conditions. You may not see the insects afflicting your houseplants, but “honeydew," a clear sticky excrement of the insect is often seen. All you need do is gently rake up the effected soil using something like the end of a pencil or pen. The Plant Health Committee has recently reviewed the National Priority Plant Pests that are exotic to Australia, under eradication or have limited distribution. It normally lives peacefully with the houseplant, however when conditions become very damp through overwatering, cool conditions or poor ventilation it rapidly multiplies and infects the plant. Disinfect pruners with a 10% bleach solution or full-strength isopropyl alcohol after using on a plant with insects or disease. Fungus Gnats: Adult fungus gnats are small (1/16 - 1/8 inch long) insects you may see flying around houseplants or resting nearby where they frequently are mistaken for fruit flies. The raking could free up the fungal spores into the air though so do be careful not to inhale them as they may potentially trigger allergies and aggravate asthma. Viruses are a broad topic, the symptoms are varied and most types of plant are effected from time to time. They have … Some labels require that insecticides be applied to houseplants outside. With root or stem rot, leaves and stems show a noticeable wilt. Pests and Diseases. Clean, healthy plants will bring a lovely addition to your home..3) Spots in Patterns on Leaves Once home, the houseplants can get infected with diseases and insects. Diseases are generally rare and harder to treat than insect infestations of houseplants. Thrips are extremely minute insects, usually less than 1/16 inch when full-grown. Non-Chemical Control of Pests and Diseases. Small wounds are normal on plants, if it's healthy and the conditions are reasonably dry it shouldn't be a problem. As a Team, we've almost 50 years of hands on experience as well as a variety of horticulture skills. He is the main content writer for the Ourhouseplants Team. They usually start on the underside although in more advanced stages they can appear on either side. They're typically spread by long term pests such as Aphids or by the plant being in close proximity to one that has already been effected with a virus. Is one of our frequently asked questions. There are many symptoms of nutrient deficiency in houseplants, although as a general rule you'll be experiencing unusual or poor growth. Other Houseplant Pests. About Houseplant Pests . Diseases in your garden can range from being bacterial, viral, and fungal. Aphids, whitefly, mealy bugs, and scale secrete honeydew when feeding. 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