Hawthorns ( Crataegus spp . ) are big shrubs or small tree that unremarkably grow in thickets in the state of nature . In the home base garden , their yellow or red fruit bring seasonal color in the fall and winter , as well as allow for food for shuttle and wildlife . In addition , belittled beast often nest in the dense , thorny leafage . Depending on the variety , hawthorn can grow in United States Department of Agriculture plant life hardiness zones 3a through 11a .
Step 1
The fungus entosporium causes tiny crimson spots on the older leaves of hawthorns . Some of the spots may have ring . As the disease onward motion , the spots get braggy , turn darker red , and break spore . In some cases , a sheeny membrane may form over the spores . Diseased farewell go down from the tree untimely . Spray a mixing of 2 1/4 teaspoon of chlorothalonil in 1 congius of water to the upper and lowly side of the leaves until the liquid runs off . Apply every seven to 14 days until the symptom are gone . During crocked or cloudy weather , go for the spray at the urge shorter intervals .
Step 2
A Scorched Plant
Fire blight is a bacterial disease that causesthe septic plant life materialof hawthorns to turn over browned or mordant and appear scorched . Once the pathogen enters a blossom , it can spread to the stems , leaves and yield . In hard case , the disease propagate to the roots of the tree diagram and can kill it . Infected flower and shoot wilt , and the ends of the shoots wind into the shape of a hook . Pink to orangish - red streaks sort under the bark of infected wood , and small cankers seem on the branch and trunk . Apply a mixture of 1/2 to 1 teaspoonful liquid Cu fungicide in 1 congius of weewee every five to seven day from the start of the blossom cps until flowering stops .
Rusty Spots
Cedar - hawthorn rusting is a fungal disease that cause ill-shapen yield and orangish - red pip on the leaf of hawthorns . Cedar - Cydonia oblonga rust fungus also do orangish - red spots on the leaves , as well as distorted growth of infected petioles , twigs , and thorns . terrible slip of both eccentric of rust cause the untimely pearl of leafage . Apply chlorothalonil at the same rate as for entosporium leaf smear mentioned antecedently .
Prevent Diseases
A haw grows 15 to 25 feet wide , depending on the specie , and should be planted at least half of its estimated matured size from other trees to permit good air circulation . Thinning out crowded branches also improve air circulation . Do not use overhead irrigation , or water during the aurora so the foliage has time to dry before evening . In addition , do not water haw while they are blooming to help prevent fire blight . overweening amounts of nitrogen fertilizer and heavy pruning promote succulent unexampled growth that is more susceptible to disease . Remove and destroy infected industrial plant material . After trim diseased plant , disinfect pruners with Lysol cleaner , bleaching agent or alcoholic beverage .
Use Caution
wear down foresighted sleeves , long pants , wind sock , shoes , and boxing glove when applying chemical substance . Wash exposed hide immediately afterwards . Do not spray chemicals on windy days and do not allow the spray to cast onto other plants . Do not contaminate bodies of water with nebuliser or gargle water . Keep people and pets out of treated areas until the nebulizer is completely dry .
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