Gardening in the Upper Midwest by Leon Snyder

By Leon Snyder

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Aphids, leaf hoppers, and plant bugs have sucking mouthparts. Rasping insects, the most common of which are thrips, scrape the surface of the leaves and other plant organs. And some insects cause gall formations. Troublesome insects can be controlled in a variety of ways. Rotation of crops and sanitation greatly reduce insect problems. Natural enemies of insects also aid in insect control. Predatory insects like lady beetles and praying mantis help, and many birds also feed on insects. Spraying to control insects should be kept to a minimum.

Adding a high-nitrogen fertilizer to the activating layer also 42 Soil and Soil Improvement helps hasten decomposition, since the decay organisms require nitrogen for their metabolism. As the pile is being built, the materials should be watered and at the center of the top of the pile there should be a depression to catch rainwater. After about 6 weeks of composting, the pile should be turned over with a fork to provide a more uniform compost. The length of time required to make compost is very variable; it depends on the size of the pile, the organic materials used, the season of the year, and the quantity of fertilizer and activator used.

The vessels are also formed from the cambium and are located inside the cambium. These are elongated in a continuous Plant Structure and Growth 23 Types of cells: a. stomate with guard cells, b. epidermis, c. parenchyma, d. stone, e. fiber, /. sieve tube, g. companion cell, h. tracheid, i. vessel. row. As the vessels mature, the end walls dissolve and the walls thicken, usually with spiral thickenings. The mature vessels form continuous tubes connecting the root tips with the leaves. The function of these vessels is to transport water and plant nutrients from the root tips to the leaves.

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