HOrT COCO-UC Master Gardener Program of Contra Costa

Note: This was originally published in the Contra Costa Times. It has been updated.Horticultural oils are lightweight oils, either petroleum or plant based, that can be an effective and low toxic choice for managing certain insect and mite pests. What you find on the shelf of your local retailer may be…

Phytotoxicity (phyto relates to plants) is the name for damage to plants caused by chemical substances. This is the time of year we hear about plants with blotches or splotches on leaves, curling leaves, or other deformities. If you have recently sprayed your plants and are seeing problems on the leaves,…

If you've noticed small, greenish-yellow beetles with twelve black spots chewing holes in your vegetable leaves, you may be hosting one of summer's most troublesome visitors: the western spotted cucumber beetle (Diabrotica undecimpunctata). This is the most common cucumber beetle species in California, and…

Earwigs are one of the most recognizable insects in the garden because that distinctive pair of pincers at the tail end makes them hard to mistake. While their prominent pincers might look ferocious, earwigs aren't harmful to people. Earwigs can be a mixed blessing: they can seriously damage seedlings and…

If you've been noticing tiny white insects fluttering up from your plants when you brush against the leaves, you're not alone. Whiteflies are one of the most common complaints we hear this time of year. The good news is that they can be managed with some straightforward strategies. Whiteflies can be a real…