Recurring Crown Fungus on Drosera dichotoma and multifida: Stronger Fungicides Needed

Sulfur Is Preventative; Systemic or Contact Fungicides Cure

A grower's D. dichotoma 'Giant Staghorn' got the same white crown fungus that killed their D. multifida extrema. They used sulfur and tebuconazole (Bayer 3-in-1).

Step Up Treatment

Sulfur won't cure established infections. Tebuconazole (systemic) is better—use it. If no improvement in 2 days, switch to Daconil (chlorothalonil), a thick gel-like spray that stays on tissue. It's very effective but messy.

Root Cuttings Clarification

Proper root cuttings: cut healthy roots into 1" pieces, lay horizontally on peat in a dome under lights. In 3 weeks, nubs form, then leaves and vertical roots. Vertical placement just yields plantlets at the crown. These plants have thick, resilient roots that survive drought and regenerate.

Dormancy Possibility

D. multifida usually doesn't go dormant; dichotoma does—looks dead but isn't. 12-hour photoperiod may trigger dormancy. Increase to 14 hours to prevent it.

Good Growing!
Jeff Dallas
Sarracenia Northwest
https://www.cobraplant.com