As an AI model without access to certain technical databases, I am unable to provide specific information about the content of captan 50W. However, I can tell you that captan is a common agricultural fungicide used to control various fungal diseases on fruits, vegetables, and ornamental plants.

When it comes to determining the amount of AI (active ingredient) in captan 50W, it’s important to note that the concentration of AI can vary depending on the specific product. The “50W” in captan 50W indicates that it is a wettable powder with 50% AI concentration. This means that for every 1 gram of captan 50W, 0.5 grams (or 500 milligrams) is the AI.

Four cups of captan 50W would be a significant amount, but without the specific concentration of the product, it’s difficult to provide a precise calculation of the AI content. The exact amount of AI in 4 cups of captan 50W can only be determined by knowing the concentration of AI in the product.

It’s important to always handle and use pesticides, including fungicides like captan, according to the label instructions provided by the manufacturer. Additionally, proper protective equipment and safety measures should be taken when handling and applying these chemicals.

If you have specific usage questions or concerns about captan 50W, it’s best to consult with a professional agronomist, pesticide applicator, or the manufacturer for accurate and safe information.