Flax lily ( Dianella spp . ) is a group of about 20 to 30 plants that have attractive grass - similar foliation and mature in U.S. Department of Agriculture flora hardiness zones 7 through 11 . Flax lily has few problems but can follow under onset by some common ornamental fungal pathogens such as rust , mould and mold . gratefully , these disease are more annoying than anything else and rarely cause long - term hurt .
Step 1
The fungous pathogen Uredo dianellae attacks flax lily , resulting in what gardeners know as rusting . Rust presents itself as cerise , purple , orange , brownish or yellow heap of spores or pustules developing on leaves . septic leave can yellow or chocolate-brown and start to shrivel up , curl up and flow off the plant untimely . Sooty mold is a black pith with a lampblack - like show on the foliage of infected flora . This annoying fungus involve honeydew — which is secrete by tomfool - sucking cuss — for grow , and typically does n’t threaten the life of the flax lily . Powdery mildew is most well tell apart by the bloodless powdery growth that form on the leaves of the septic plants . This extremely contagious fungal disease does n’t require moisture to grow and water supply can in reality inhibit the growth and spread of the fungal spores .
Step 2
Organic Control
Fungicides wo n’t get disembarrass of jet mold and control ask handle the louse secrete the sticky honeydew . Insecticides are generally not recommended since they can stimulate more harm than dependable . rather , attract beneficial predatory dirt ball to prey on the honeydew - bring forth dirt ball infest the flax lily . ladybird and lacewing — which eat on aphid , scales , whiteflies , mealybugs and thrip — can be attracted to your garden by set California poppy ( Eschscholzia californica ) , Coriandrum sativum ( Coriandrum sativum ) and Petroselinum crispum ( Petroselinum crispum ) . Once you have assure the insects , wash the pitchy mold off the flax lily by spray the plant with a water hose . If you do n’t wash the sooty mold off the plant , it will lento disappear on its own .
Chemical Control
Neem oil , horticultural crude and potassium bicarbonate are three fungicides that assist control fungal diseases such as rust and powdery mildew . Each eccentric of fungicide lists specific instructions , warning and app rates that you should follow to improve its effectiveness and prevent damage to the flax lily . Unless otherwise stated on the fungicide label , the chemical substance should be applied on a daylight when the confidential information is unagitated , the temperature are above 40 degrees Fahrenheit but below 90 level and when rainwater will not occur 24 hours after the program . If possible , spray the flax lily with the chosen fungicide at the first signs of contagion .
Cultural Control
Most fungal diseases can be kept at bay by implement right cultural control methods in your garden . Proper spatial arrangement between the flax lilies and surrounding plants avail to see to it good airflow . breeze circulation dries leaves more quickly and reduce fungous growth . Also annul overhead watering since it favors the sprouting and bed covering of fungal diseases such as rust . or else , water at the base of the flax lily early in the Clarence Day to allow the plant to dry out before the sun goes down . Good sanitation also helps hold flax lily problems ; polish off all flora debris that has fall to the ground and prune infected plant affair off the flax lily .
