Although the economic injury level (EIL) and the economic threshold (ET) are fundamental integrated pest management (IPM) concepts, they are often confused. According to studies by state regulators, roughly 9 percent of groundwater wells in Wisconsin exceed the acceptable level of nitrate in drinking water. However, in agriculture we can easily determine the value of the product that we are trying to produce, and can set an action threshold based on this value. This is referred to as an economic threshold, and is the basis of integrated pest management recommendations in crop production. An economic threshold is the insect's population level or extent of crop damage at which the value of the crop destroyed exceeds the cost of controlling the pest. High levels of nitrate in drinking water can suggest that other contaminants are also moving in a water source. Economic threshold. This number gets as high as 21 percent in agriculture-heavy areas. Following a Primary Industries Ministerial Council agreement in October 2005, tolerance levels for GM canola in non-GM canola were set at 0.9 per cent for grain and 0.5 per cent for seed for sowing. Integrated pest management (IPM), also known as integrated pest control (IPC) is a broad-based approach that integrates practices for economic control of pests.IPM aims to suppress pest populations below the economic injury level (EIL). There is usually a minimum tolerance level between 2% and 5% damaged fruit in processing tomatoes, therefore in-season economic threshold levels are based on pest densities that will prevent damage from exceeding tolerance levels at harvest (Hoffmann et … Source: Entomological Society of America "Handbook of Soybean Insect Pests," Leon G. Higley and David J. Boethel, eds. Economic thresholds can be expressed in a variety of ways including the number of insects per plant or … This is understandable, as the concepts are closely related and the definitions of EIL and ET can be expressed differently depending on context. The pest density at which management action should be taken to prevent an increasing pest population from reaching the economic injury level." Thresholds or tolerance levels are the maximum allowable level of adventitious (unintended) presence of material set by regulators and / or markets.