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Augusta County, Virginia

Information provided for informational purposes only

Note: This information is provided for reference purposes only. Although the information provided here was accurate and current when first created, it is now outdated.

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Pesticide Table for the Madison Cave Isopod | About the Madison Cave Isopod
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Pesticide Table for the Madison Cave Isopod

Table of Pesticide Active Ingredients

Active Ingredient Code
AZINPHOS-METHYL 7
BENOMYL 7
CAPTAN 7
CARBARYL 7
CARBOPHENOTHION 7
CHLOROTHALONIL 7
DIAZINON 7
DIFLUBENZURON 7
DIMETHOATE 7
METHIDATHION 7
METHOMYL 7
METHYL PARATHION 7
NALED 7
PARATHION (ethyl) 7
TRICHLORFON 7
TRIFLURALIN 7

Limitations on Pesticide Use

Code Limitations
7 Do not apply this pesticide within 20 yards of the edge of all cavern, sinkholes, and surface waters within the shaded area for ground applications, nor within 100 yards for aerial applications.
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Madison Cave Isopod [Antrolana]

The Madison Cave isopod is a white, blind, shrimp-like crustacean that grows up to 12 millimeters (0.4 in) in length. Organic matter and detritus that has been washed into its habitat by surface runoff is the primary source of food for this species. Egg-bearing females have never been found but it is believed that they hide in leaf litter or in the inaccessible channels which feed into cave pools.

The Madison Cave isopod inhabits three underground freshwater pools that are fed primarily by an aquifer in Augusta County, Virgina. This species occurs in two pools in the Madison Cave, one pool in Stegers Fissure, and possibly in the fissures and channels that connect the pools with the aquifer and the South River. Very few of these isopods have ever been collected and the population size is unknown.

The historic extraction of bat guano along with cave visitors and spelunkers are believed to have reduced isopod viability buy reducing food supplies and causing siltation of the pools. Currently, the cave's private owner has taken careful measures to protect the welfare of this species through careful conservation efforts. However, pollution continues to be a threat especially during periods of prolonged high water.

Matthews, J.R. (ed.), The Official World Wildlife Fund Guide to Endangered Species, Beacham Publishing Inc, Washington, DC. Vol II, pp. 955-956.

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