With the onset of warm weather and outdoor eating, expect an increase in yellowjacket activity (Figure 1). Your local retail nursery and garden center probably carries yellowjacket lure traps, and it's important to know if they work and how to use them. University of California, Riverside entomologists recently tested yellow lure traps (Figure 2) in picnic areas in parks in Southern California and demonstrated that proper use of traps can provide protection of local areas, such as eating areas, in many situations.
Traps don't eliminate large populations but can help reduce numbers of localized foraging workers. Lure traps contain a chemical that attracts yellowjackets into the traps, but the common lure in traps, heptyl...
In the backyard or in the wild, roguing (selectively pulling or cutting weed plants) and herbicide spot treatments can help prevent small patches of invasive weeds from becoming large infestations. However, herbicide applications may be of little value where senescent plants have already set seeds, because the dead “skeleton” plants may bear dormant but living seeds, which can initiate new infestations.
In the past, such plants may have been removed by stacking and burning them. However, under present conditions, burn permits are hard to come by. Landfill disposal is another option, but transporting seed-bearing plants may spread the seeds, making the problem worse instead of better. Deep burial of plant material...
[From the July 2014 issue of the UC IPM Retail Nursery & Garden Center News]
In recent years, you may have seen a strange “new” bug in your garden, especially on tomatoes and pomegranates. These insects may be leaffooted bugs. Although they are native to the western United States and not new to California, leaffooted bugs seem to be occurring more commonly in gardens. These distinctive bugs get their name from the small leaf-like enlargements on the hind leg (Figure 1). They are medium to large sized insects that prefer to feed on fruits and seeds and are often found in.../span>
- Author: Karey Windbiel-Rojas
[From October 2013 issue of the Retail Nursery and Garden Center IPM News.]
Traps and physical barriers can be excellent tools for detecting, catching, or preventing pest invasions. Most retail nurseries and garden centers carry a variety of these types of tools, often displayed together with other products to help customers implement a multi-pronged IPM program to most effectively manage their pests.
Traps may be used to monitor or detect a pest population, to catch and identify the pest, to reduce local pest density, or more than.../span>
We've been getting calls this summer from gardeners finding fire blight damage in backyards and landscapes. Fire blight is usually associated with wet springs. Although spring 2014 wasn't particularly wet, rain occurring when apples, pears, quince, cotoneaster, and pyracantha are in bloom can induce the disease even in dry years.
The malady is called fire blight because terminals of affected branches suddenly blacken and die as if they've been scorched by fire (Figure 1). The disease is caused by the bacterium Erwinia amylovora, which commonly enters trees and shrubs through blossoms in rainy weather. Ideal conditions for disease development are rainy or humid weather with mild daytime temperatures (75° to...