How do I control flower bud borer and leaf spot in marigold grown for extraction?

Bud borer caterpillars bore into the flower buds and eat the developing flower, directly cutting the flower tonnage the company pays for, while leaf spot and blight diseases damage the foliage and reduce plant vigour in wet humid weather. For the borer, monitor with pheromone traps, hand pick and destroy damaged buds and caterpillars where feasible, encourage natural enemies, and where spraying is needed use only an insecticide labelled for the crop and pest at the label dose, with attention to the waiting period since the flowers go for processing. For leaf spot, ensure spacing and airflow, avoid prolonged leaf wetness, remove badly affected leaves, and use only a labelled fungicide if required, rotating modes of action. Since this is a contract crop going for extraction, confirm with the contracting company what chemicals and waiting periods they accept, and get a current programme from your KVK so your flowers are not rejected on residue or quality.