Spray in Apple 20 Days After Walnut Stage: What You Need to Know
If you are an apple grower, then you know the importance of timing your sprays during the growing season. One critical time to apply a spray is 20 days after the walnut stage. But what exactly is the walnut stage, and why is this spray important? In this article, we will explain what you need to know to ensure a successful apple crop.
What is the walnut stage?
The walnut stage refers to a period in the apple growth cycle where the fruit size is about the same as a walnut. During this stage, the fruit cells rapidly divide and expand, and the fruit reaches its maximum size. This stage usually occurs between 50-70 days after full bloom, depending on the apple variety and growing conditions.
Why is the spray important?
The spray applied 20 days after the walnut stage is critical because it targets the second generation of apple maggot flies. These flies lay their eggs in the apple fruit, which then leads to maggots feeding on the fruit. The spray is designed to kill the adult flies before they can lay their eggs, thus preventing damage to the apple crop.
The spray also provides protection against other insects and diseases that can harm the apple crop. Common pests at this time, such as codling moth, can cause serious damage to the fruit if left untreated. Additionally, the spray can help prevent fungal diseases such as apple scab and powdery mildew, which can impact the quality and yield of the apple crop.
What spray should you use?
The recommended spray for 20 days after the walnut stage is a combination of insecticides and fungicides. The insecticide should be effective against apple maggot flies, while the fungicides should target common fungal diseases. Your local extension service or crop advisor can provide guidance on the best products to use in your area.
When should you apply the spray?
Timing is critical when applying the spray 20 days after the walnut stage. The spray should be applied when the fruit is about the size of a golf ball, or approximately 1.5 inches in diameter. This timing ensures that the spray is effective against the second generation of apple maggot flies and provides adequate protection against other pests and diseases.
In conclusion, the spray applied 20 days after the walnut stage is a critical step in ensuring a successful apple crop. By targeting the second generation of apple maggot flies and providing protection against other pests and diseases, this spray can help maximize yield and quality. Ensure that you select the appropriate products, apply them at the correct time, and follow all label instructions for proper use.