Look for small holes on your tomato leaves. The flexible and soft wings may be flat, bright and striped . The blister beetles that are black in color have gray to cream bands at the margins. This pest typically travels in groups, so you should also be able to find the insect itself fairly easily. Blister beetles are most likely to come into contact with homeowners as they are gardening, trimming shrubs or planting flowers, so wear protective gloves and long sleeve shirts to help prevent blister beetle exposure. Blister Beetles Do A Lot Of Damage To Crops. Ash-gray blister beetles are gray and black blister beetles are black in color. Nuttall blister beetle adults are metallic green or purplish (16-28 mm long). Damage/injury: Blister beetles secrete an oily, yellow substance called cantharidin, which is a poisonous chemical that can cause burns and blisters on contact with skin. Striped beetles have brown to gray colors with vertical yellow strips on the wings. pests of certain crop, fodder and landscape plants.

The beetle releases the chemical from specialized vessels in its Although the presence of blister beetles in different crops is usually not considered to be a serious constraint (Hill, 1975; Zhu et al., 2005), infestations of crops grown in small-holder plots may cause considerable damage because of the gregarious nature of adult beetles (Hall, 1984; Nikbakhtzadeh, 2004). Ingestion can cause toxic effects to livestock. They are especially threatening to tomato, potato, beet and alfalfa crops. When large numbers of blister beetles swarm they can do major damage to commercial crops. When consumed, cantharidin can aggravate the animal’s urinary and gastrointestinal tracts, sometimes leading to fatalities. When a swarm descends on alfalfa fields for example, it can completely strip it in a matter of hours. Blister beetles are most likely to come into contact with homeowners as they are gardening, trimming shrubs or planting flowers, so wear protective gloves and long sleeve shirts to help prevent blister beetle exposure. According to the University of Illinois Cooperative Extension, blister beetles are chewing insects that attack your tomato plants by chewing holes in the foliage. Damage The larvae of the common blister beetles are beneficial, since they destroy grasshopper egg pods. The best ways to control them naturally is diatomaceous earth, handpicking, and trap crops. Blister beetles are a nasty, toxic pest in your garden that can cause skin irritation. The best ways to control them naturally is diatomaceous earth, handpicking, and trap crops.

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