What Is a High Lc50

The higher the LD50 or LC50 value the less toxic the herbicide. This may seem, at first glance, to be incorrect. The higher the LD50 means it takes more of the herbicide to kill half of the test animals; therefore, the product is considered less toxic than those herbicides which kill half the animals at lower doses.

What LC50 is considered toxic?

Table 1: Toxicity Classes: Hodge and Sterner Scale1Extremely Toxic10 or less2Highly Toxic10-1003Moderately Toxic100-10004Slightly Toxic1000-10,000

What is a low LD50?

A low LD50 means the species is highly susceptible to the poison. The LD50 for a particular poison can vary greatly between different species of animals. Since LD50 is quoted in mg/kg of body weight, the amount of poison to kill an animal is a direct function of the species’ body weight.