How to fight spider mites on chrysanthemums? - briefly
Effective control of spider mites on chrysanthemums requires regular application of horticultural oil or a licensed miticide, combined with frequent rinsing of foliage to dislodge mites. Maintaining high humidity and removing heavily infested leaves further suppresses population buildup.
How to fight spider mites on chrysanthemums? - in detail
Spider mites on chrysanthemums appear as tiny moving specks on leaf surfaces, often leaving fine webbing and stippled, yellow‑white lesions. Damage intensifies under dry, warm conditions and can lead to extensive defoliation if unchecked.
Cultural measures reduce mite proliferation. Maintain adequate soil moisture through regular watering; moist foliage discourages mite development. Increase ambient humidity by misting or using a humidifier, especially during peak summer heat. Remove heavily infested leaves and prune overcrowded growth to improve air circulation. Avoid excessive nitrogen fertilization, which promotes tender foliage favored by mites.
Biological agents provide targeted suppression. Predatory mites such as Phytoseiulus persimilis and Neoseiulus californicus consume all life stages of spider mites when released at recommended rates. Lady beetle larvae (Stethorus punctillum) and lacewing adults (Chrysoperla carnea) also contribute to population decline. Entomopathogenic fungi, for example Beauveria bassiana, infect and kill mites upon contact; apply according to label instructions to ensure efficacy.
Chemical options serve as a last resort when thresholds are exceeded. Select miticides with distinct modes of action—abamectin, spirotetramat, or sulfur formulations—rotating products to prevent resistance. Apply at the early sign of infestation, covering both leaf upper and lower surfaces. Observe pre‑harvest intervals and protective equipment requirements indicated on product labels.
Integrated pest management relies on regular scouting. Inspect foliage weekly, counting mites per leaf disc; act when populations surpass established economic thresholds. Combine cultural, biological, and chemical tactics in a coordinated program to maintain low mite levels while preserving plant health and environmental safety.