Insect Pests, Gardening & Pests, Lawn & Garden

Elm Leaf Beetle: Pest Notes for Home and Landscape

Elm leaf beetle, Xanthogaleruca (=Pyrrhalta) luteola, is one of the most important insects damaging urban forests in the United States and is the major pest of elm trees in California.

Publication Number:: 7403

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Eucalyptus Longhorned Borers: Pest Notes for Home and Landscape

Two closely related species of longhorned borers (family Cerambycidae) attack eucalyptus in California. They are attracted to freshly cut wood, dying limbs, and trees suffering from stress, especially drought stress.

Publication Number:: 7425

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Eucalyptus Tortoise Beetle: Pest Notes for Home and Landscape

The eucalyptus tortoise beetle is found throughout southern California, the Central Valley, and the San Francisco Bay Area. Adults and larvae chew semicircular or irregular notches along edges of eucalyptus leaves and can remove most of a leaf’s surface.

Publication Number:: 74104

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Ferrisia gilli: A New Mealybug Pest of Pistachios and Other Deciduous Crops

Ferrisia gill is a mealybug species in California that affects pistachio plantings in 11 counties. Find out how to monitor and control the pest's spread using biological and chemical means.

Publication Number:: 8207

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Fleas: Pest Notes for Home and Landscape

Fleas are frequently encountered in homes and are common pests on domestic cats and dogs.

Las pulgas son encontradas con frecuencia en hogares y son pestes comunes en gatos y perros domésticos.

Publication Number:: 7419

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Flies: Pest Notes for Home and Landscape

Of the thousands of species of flies, only a few are common pests in and around the home. These pests breed in animal wastes and decaying organic material from which they can pick up bacteria and viruses that may cause human diseases.

Publication Number:: 7457

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Fungus Gnats: Pest Notes for Home and Landscape

Fungus gnats occur around damp, decaying vegetation, algae, and fungi. These flies can appear in large numbers in or around buildings and also can be a problem in greenhouses, nurseries, and interior plantscapes.

Publication Number:: 7448

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Giant Whitefly: Pest Notes for Home and Landscape

Since its introduction into southern California in 1992, the giant whitefly has spread rapidly northward along the coast and into interior valleys. It can severely infest many ornamental plant species found in nurseries, landscapes, and home gardens.

Publication Number:: 7400

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Glassy-Winged Sharpshooter: Pest Notes for Home and Landscape

The glassy-winged sharpshooter can spread the disease-causing bacterium Xylella fastidiosa which is the causal agent of devastating plant diseases such as Pierce’s disease, oleander leaf scorch, and almond leaf scorch.

Publication Number:: 7492

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Goldspotted Oak Borer: Pest Notes for Home and Landscape

Goldspotted oak borer attacks xylem and phloem layers near the base of oak trees and can girdle and kill mature oaks. A San Diego area pest, it may eventually spread to other areas of California. Learn identification and treatment methods.

Publication Number:: 74163

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Grasshoppers: Pest Notes for Home and Landscape

Grasshoppers are sporadic pests in gardens. However, in some years large populations may build up in foothills and rangelands, especially after a wet spring and then migrate into nearby gardens, often defoliating everything in sight.

Publication Number:: 74103

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Hackberry Woolly Aphid: Pest Notes for Home and Landscape

Hackberry woolly aphid, sometimes called Asian woolly hackberry aphid (Shivaphis celti), infests hackberry, especially Chinese hackberry (Celtis sinensis), throughout the state.

Publication Number:: 74111

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Hobo Spider: Pest Notes for Home and Landscape

The potentially poisonous hobo spider does not live in California and has never been documented in the state. There are many cases, however, of common related spiders being misidentified as hobo spiders.

Publication Number:: 7488

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Hoplia Beetle: Pest Notes for Home and Landscape

The hoplia beetle is a common pest of roses and other plants in many parts of California, especially the Central Valley. It is a problem from late March to May when the adult beetles feed on light-colored blossoms.

Publication Number:: 7499

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Horsehair Worms: Pest Notes for Home and Landscape

Horsehair worms belong to the phylum Nematomorpha, class Gordioida. They are also called Gordian worms. They occur in water sources such as ponds, rain puddles, swimming pools, animal drinking troughs, and even domestic water supplies.

Publication Number:: 7471

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How to Reduce Bee Poisoning from Pesticides

Discusses methods to protect bees from hazards associated with pesticide application.

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Publication Number:: PNW591

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Indian Walking Stick: Pest Notes for Home and Landscape

Walking stick insects came from India to California through the pet trade but have escaped the cage and are now found in the wild in southern and coastal areas. Newly emerged nymphs may feed heavily on new flush growth in landscape plants.

Publication Number:: 74157

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Invasive Shothole Borers: Pest Notes for Home and Landscape

Invasive shothole borers are non-native beetles that bore into trees and introduce a fungus that causes the tree disease known as Fusarium dieback. Curretnly invasive in Southern California; but because of the wide host range, if left unmanaged, it can potentially spread to the rest of California and neighboring states.

Publication Number:: 74179

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Key to the Phytoseiid Predatory Mites Found on California Crops

This publication will aid in the identification of the forty-six most common phytoseiid mites found on crop plants, and in some instances, adjacent wild plants in California.

Publication Number:: 8696

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Lace Bugs: Pest Notes for Home and Landscape

Many kinds of lace bugs, family Tingidae, feed on landscape plants throughout the United States. Hosts include alder, ash, avocado, azalea, coyote bush, birch, ceanothus, fruit trees, photinia, poplar, sycamore, toyon, walnut, and willow.

Publication Number:: 7428

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Lawn Insects: Pest Notes for Home and Landscape

Insects are not a common cause of residential lawn damage in California, but certain species occasionally damage or kill turfgrass. Insect feeding can cause grass to turn yellow or brown, or die, especially if the grass is already stressed.

Publication Number:: 7476

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Leafrollers on Ornamental and Fruit Trees: Pest Notes for Home and Landscape

Fruittree leafroller, Archips argyrospila, can be a serious pest throughout California. It occurs on a very large number of ornamental trees and is particularly damaging to deciduous and live oaks.

Publication Number:: 7473

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Mealybugs: Pest Notes for Home, Garden, and Landscape

Mealybugs are soft, oval, wax-covered insects that feed on many plants in garden, landscape, and indoor settings. Usually found in colonies, they are piercing-sucking insects closely related to soft scales but lack the scale covers.

Publication Number:: 74174

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Millipedes and Centipedes: Pest Notes for Home and Garden

Millipedes and centipedes are often seen in and around gardens and may be found wandering into homes. Unlike insects, which have three clearly defined body sections and three pairs of legs, they have numerous body segments and numerous legs.

Publication Number:: 7472

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