Structural Pest Control Applicator Practice Exam

What is a common factor that can influence the level of pesticide residue in crops?

1. Type of weather

2. Application method

3. Soil type

4. All of the above

The correct answer is: All of the above

The level of pesticide residue in crops can be influenced by multiple factors, and all the mentioned elements play a significant role in this process. Type of weather is crucial because conditions such as temperature, humidity, and rainfall can affect how quickly a pesticide degrades or how much can wash off into the soil or nearby water sources. For example, heavy rainfall shortly after application can lead to increased runoff and potentially higher residue levels on crops. Application method impacts residue levels as well. Different methods, such as spraying, drenching, or soil incorporation, have distinct effects on how much pesticide remains on the crop and how effectively it penetrates the plant tissues. Certain methods may lead to more uniform application, while others might result in excess residues. Soil type is another factor that influences residue levels. Different soil compositions can affect how pesticides break down or how readily they are absorbed by plant roots. For instance, sandy soils may allow for quicker movement of the pesticide through the soil, potentially reducing residue levels, while clay soils may bind pesticides more effectively, leading to higher residues in crops. In summary, all these factors interplay to influence the overall level of pesticide residue found on crops, making the choice that encompasses all these elements the most comprehensive answer to the question.