Q. I live in the central Las Vegas Valley and noticed a creep of linear white deposits on the stems of plants in my raised vegetable garden that has recurred in some desert-adapted plants elsewhere in the yard. It first appeared on sunflower stems, then lacinato kale, some basil, tomatoes and their stems, and now on new growth from a Vitex tree and turpentine bush. It seems to be spreading, in other words. Can you advise what this is, and any way to remedy it? A. Those “white deposits” are probably tiny “cocoons” of tiny insects in the landscape. I reorted these on my blog in previous years, calling them “white fuzzies”. I didn’t know what they exactly were either, but I knew that they were insect related. A horticulturist in the Phoenix area guessed that they were sharpshooter (insect) pupae, and he may be right. In any regard, these insect pupae “were just passing through” the landscape where they were “incidental” and probably not damaging these plants. Generally speaking, when we see white deposits on many different kinds of plants it’s usually not disease-related but may be related to insects. If guessed that these white deposits in this case are “insect related” then look at the plant and note any damage you might see. If there is no damage, then these insects are “incidental” to your plants. If you see insect damage to the plants, then they might not be “incidental” and it’s best to use your favorite least toxic insect spray and see if that stops the problem. Soap and water is usually a good first, least toxic spray and readily available. You can always try something more toxic as your second spray if that doesn’t stop the damage.