Spacing and sunlight are important factors for preventing rust and mildew on Zinnia elegans, as they can help promote good air circulation and reduce conditions that are favorable for fungal growth. Based on the information you provided (landscape fabric ground cover, drip irrigation, and 6 hours of direct sunlight per day), it sounds like you have taken appropriate measures in terms of spacing and sunlight for your Zinnia elegans plants.

As for fungicide applications, it's important to follow the manufacturer's instructions for the specific product you are using, as different formulations may have different application rates and frequencies. In general, for organic fungicides like neem oil or baking soda solution, you may need to apply them more frequently compared to synthetic fungicides. For example, you may need to apply neem oil or baking soda solution every 7-10 days or after rain events, as they may break down more quickly compared to synthetic fungicides. Be sure to thoroughly coat the foliage, including the undersides of leaves, as this is where fungal spores often reside.

However, it's worth noting that prevention and early intervention are key in organic gardening, so it's generally recommended to start applying fungicides as a preventive measure before the onset of rust and mildew. Regularly monitor your plants for any signs of rust or mildew, and at the first sign of infection, begin applying the organic fungicide according to the instructions on the product label.

It's also important to integrate fungicide use as part of an overall integrated pest management (IPM) approach, which includes practices such as proper watering, good air circulation, and plant selection, as mentioned earlier. IPM focuses on preventing and managing pest and disease issues through a combination of cultural, mechanical, biological, and chemical methods in an environmentally responsible and sustainable manner.

In summary, pay attention to spacing, sunlight, and follow the manufacturer's instructions for fungicide applications, and integrate them as part of an overall IPM approach to effectively prevent and manage rust and mildew on your Zinnia elegans plants.
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