Tuesday, August 04, 2015

Home News Aphid populations increasing in some greenhouses

Aphid populations increasing in some greenhouses

Natural predators moving into greenhouses offer some control

David Kuack | June 21, 2010

Aphids can be a major problem on plants still in greenhouses. Members of Univ. of Md. Extension are reporting finding aphids on zinnias, snapdragons, petunias, peppers and eggplants. Fortunately, there are several predators that can move into greenhouses to help reduce aphid populations.
Some of these predators can also be ordered from biological suppliers and released in the greenhouse in spring to provide early season control. Extension personnel recommend monitoring aphid levels to determine if a pesticide is needed to knock down populations. If biological controls are being used or will be released choose insecticidal soap and horticultural oil since these products have less of an impact on beneficial insects.
High numbers of soldier beetles and other predators have also been seen on perennials. Extension personnel said they are seeing an unusually high number of these beetles this year. There are 16 genera and 455 species of soldier beetles known in North America.
The adult beetles, which are also referred to as leatherwings, feed on nectar, pollen, honeydew and small insects. Their larvae feed on insect eggs, small caterpillars, fly larvae and other soft-bodied insects.
 
Pictured: Aphidius sp., a parasitic adult wasp, and aphids that have been parasitized by the wasp.
Photo courtesy of Univ. of Md.
 

Top news

UC Davis to host neonic conference

The Sept. 9 event aims to separate the truth from the myth of neonicotinoids and their impact on pollinators.

SNA announces 2015 award recipients

The Southern Nursery Association honored 10 of its members with awards at its annual meeting.

New live oak cultivar named after ACTrees founding member

Arizona's Civano Nursery developed the cultivar to withstand the arid conditions of the Southwest.

Asian citrus psyllid quarantine expands

An 87-square mile area of Los Angeles county has been added to the existing quarantine.

Coalition puts focus on trees during drought

A new partnership has kicked off a campaign to raise awareness of the importance of proper tree care.

x