- Author: Igor Lacan
In the December 2013 issue of the Green Bulletin, we looked at “Pruning and Tree Physiology: The Bad and the Ugly” for pruning and maintaining ornamental trees as well as some pruning pitfalls. However, pruning can also be highly beneficial for many landscape trees. In this article I will review some approaches to pruning which either directly suppress pests or which maintain tree health, and because impaired health predisposes trees to a number of diseases, these pruning measures could thus be considered a part of an integrated pest management program.
Formative pruning: A young tree arriving from the nursery or...
[From the August 2014 issue of the Green Bulletin, a newsletter for landscape and structural professionals]
While one of the best methods to reduce weeds is to not water them, there are some that survive even in drought conditions (Fig. 1). As we continue to be impacted by the drought in California, we need to consider our weed management strategies:
- Which weeds will survive?
- How do drought conditions affect control?
Which weeds will survive?
Many weeds, once established, need very little water to survive. Weeds with extensive, deep root.../span>
- Author: Cheryl Reynolds
As summer is quickly coming to a close, and most kids have already headed back to school or will be returning in the next couple of weeks, integrated pest management will be an expected and important tool for the upcoming school year. Classrooms, playgrounds, and athletic fields that were quiet during the summer months will once again be filled with the sounds of learning and playing. Landscape and pest management professionals have been taking advantage of the slow summer months preparing the grounds and facilities for the upcoming year. While at one time this may have meant heavy applications of pesticide to rid the facilities of pest problems, today schools are healthier environments for our...
The hackberry woolly aphid (Shivaphis celti), sometimes called Asian woolly hackberry aphid, infests the widely planted Chinese hackberry (Celtis sinensis) and other Celtis species. Often, the first observed sign of a hackberry woolly aphid infestation is the sticky honeydew it produces, upon which blackish sooty mold grows, creating a sticky mess on leaves and surfaces beneath infested trees.
These aphids also secrete pale wax, which covers their bodies. Woolly aphids on shoot terminals and leaves appear as fuzzy, bluish or white masses, each about 1/10 inch or less in diameter. Winged forms have distinct black borders along the forewing veins and their antennae have alternating dark and light...
[From the July 2014 issue of the UC IPM Retail Nursery & Garden Center News]
Fungus gnats are small flies that infest soil, potting mix, or plants grown in pots or containers (Figure 1). Your customers may complain about fungus gnats resting on or swarming around plants or soil or flying around windows in their houses.
Adult fungus gnats don't harm plants or people, but they can be annoying. On the other hand, fungus gnat larvae (Figure 2), which live in soil and feed on roots, can be damaging when their numbers are very high, sometimes causing plants to wilt. Their feeding.../span>