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Trees In 1990, the Clark County Board of Health outlawed the planting of fruitless Mulberries and placed restrictions on which olive tree varieties could be planted. The restrictions were an effort to control the increase in pollen counts in the valley. The only olive varieties that are legal to plant are Swan Hill and Wilson. The Cottonwood Shield Bearer (larva of a silvery gray moth) This larva causes damage to Cottonwood trees by leaving large numbers of holes and brown patches on the leave of the tree. The damaged leaves drop from the tree prematurely. The larvae live inside the leaves, so they are difficult to control. Acephate used as a spray or an implant may be helpful, but caution should be used with acephate because it can be harmful to the tree. Tips for healthy trees 1. Leave them alone. Trees can generally fend for themselves. 2. Watch where you dig. A root system can extend 2 to 3 times farther than the branches. 3. Avoid parking vehicles under trees. The stress can damage the roots. 4. Lawn mowers and weed whackers can damage the bark of a tree by nicking it. This damage can weaken the tree and make an entry for disease. 5. Mulch regularly. The mulch will provide protection from your mower and weed whacker and it will suppress weeds and allow the ground moisture to stay in the soil. 6. Don’t over-water or over-fertilize. 7. Mature trees will usually only need pruning when there are dead or damaged branches. 8. Know the trees in your yard and the diseases they can have. Many diseases are specific to certain species. 9. Regularly check the leaves and branches of your trees for signs of insect activity, dead twigs and spots on leaves. |
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