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The Economics of Aphids Infestations

There are both wingless and winged forms, according to Matt O’Neal, assistant professor, Entomology. He says wingless soybean aphid adults are about 1⁄16 inch in length, pale yellow or green, and have dark-tipped cornicles (tail pipes) near the end of the abdomen. The winged form has a shiny black head and thorax with a dark green abdomen and black cornicles.

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It Takes Three to Make a Plant Sick

The first “side” of the triangle is so obvious it may be overlooked. In order to have a plant disease, you must have a plant. More specifically, you need a susceptible plant, one that is able to get a particular disease. Each plant species is prone to a unique set of maladies. Crabapples and oaks get different diseases. Within a species, plant varieties differ in their susceptibility to various diseases. For example, some crabapple cultivars are decimated by apple scab while others are unaffected. The overall health and vigor of an individual plant also affects its susceptibility to disease.

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Bagworms: A Review and a Prediction

The bagworm caterpillar lives its entire life inside a tough protective case made of silk and camouflaging bits of foliage. Each caterpillar makes its own bag that it carries around as it feeds with the head and legs sticking out the open, top end of the bag. As the caterpillar eats and grows the bag is enlarged until by the end of the summer, what started as tiny pods only one-quarter inch long will have grown to almost two inches in length.

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Achoo! Was that your Plant Sneezing? Can Plants get the Flu?

The time of year has arrived when people begin to worry about fending off the common flu viruses. The feelings of malaise caused by viruses can lead to some unproductive days in the garden. This is the time of year when one should be busy clearing out diseased leaves and stems to ensure healthy plants next year. Some might wonder if plants can get the flu. Plants are susceptible to a variety of virus diseases, although the general term “flu” is not used in the plant world. Fortunately, the virus diseases that infect plants are unique to plants. They don’t infect people.

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Shucking Oystershell Scale

Among the more secretive creatures in the animal world are armored scale insects. These tiny insects (less than 1/8 inch long) live under a protective cover on the leaves or bark of their host plant. Armored scales are enclosed in this cover that is constructed of wax, shed skins and other substances.

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Looking Ahead to White Grubs in the Lawn

The white grubs that routinely damage lawns in Iowa are called annual white grubs. These root-eating, underground June beetle larvae have one generation per year and take one year to complete their life cycle of egg, larva, pupa and adult. The adult beetles of our annual white grubs are specific kinds of June beetles called masked chafers. They are tan or straw brown in color and as the name implies, they have a black stripe across the eyes and face. The masked chafers begin flying in late June and lay eggs in the turf during July.

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Freeze Damage to Landscape Plants

Fortunately, trees and shrubs have the ability to leaf out again if the initial growth is damaged or destroyed.  Healthy, well established trees and shrubs should not be greatly impacted and will produce additional growth within a few weeks.  Trees and shrubs planted within the past 3 to 5 years may benefit from a light application of fertilizer and periodic watering during dry weather.

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