Question
I have a spider plant that over all looks very healthy.  It grows rather steadly and flowers regulary.  Last year I moved the plant to my work.  One day I noticed a ugly brown spider on it. Since then, it has been getting small brown raised dots on it's stems and a sticky substance on it's leaves.  The brown dots wipe easily off the plant. About 3 months ago I completly trimed off all the leaves & stems that had the dots or stickyness on them. (I never found any bug spiders.) Well they are back!  I would hate to just toss this plant because otherwise it seams realy healthy.  What could be the cause and what can I do to save it?  I would perfer a solution that is pesticide free if possible.  If it helps I can send a picture.
Thanks
Kathleen  

Answer
Hi Kathleen,

Your spider plant has an infestation of scale insects. (The presence of the brown spider was just coincidental and unrelated.)

Scale can be hard to detect. When they are young these sucking insects are slightly oval, slightly raised, translucent bumps about an eighth of an inch long. They can be found along stems and on the undersides of leaves. They don't look like bugs and don't appear to move. As they get older, they develop a hard, dark brown shell and look like a small mole. As the infestation increases, these sucking insects will secrete a sticky substance called honeydew that falls onto leaves, furniture and floors. This stickiness is the most obvious sign of scale and the one that most people notice first.

The key to eliminating scale is to treat even the ones that you cannot see. That means thoroughly drenching all leaf and stem surfaces until they are dripping wet. With a spider plant, it is particularly important to get the spray in the crevices where the leaves emerge. It is also best if you repeat this treatment all over again in 5 to 7 days to catch any crawlers (the translucent young ones) that you missed the first time. After that, you should check your plant weekly to see if they return.

Soap sprays are not as effective as some other treatments because soap doesn't always penetrate the hard outer shell of the scale.

I do not recommend any pesticides because they are all hazardous to use and not 100% effective against scale. The best non-toxic treatment for mealybug and scale is called Brand X Foliage Cleaner. It is available through Southwest Plantscape Products in California (www.southwestplantscape.com). Their phone is 1-800-333-7977.It is a silicon-based product so it is very slippery. Its ability to penetrate is probably the key to its effectiveness because it gets into the tiny crevices that other sprays miss.

You may want to try spraying with rubbing alcohol that will help break through the hard outer barrier of the scale and kill it. Mix 1 part alcohol with 5 parts of water. Add a little liquid soap to help it spread.

Sun Spray Ultra Fine horticultural oil is also mixed with water and effectively smothers the scale. Complete coverage is important.

Another good non-toxic spray is Hot Pepper Wax. Its main ingredient is hot cayenne pepper that overheats the plant pests. There is an information website for it at www.hotpepperwax.com.

Finally neem oil works similarly to horticultural oil. It should be diluted with water and Pine Sol to counteract the onion-like odor. All of these are  available nationwide at plant and garden centers and also by mail order.

Important: None of these should be applied to plants in direct sun or in high temps.

Please let me know if any of this is unclear or if you have any additional questions.

Regards,
Will Creed, Interior Landscaper
Horticultural Help, NYC

You can E-mail me directly at: [email protected]

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