Japanese holly ( Ilex crenata ) is a desirable bush for its little evergreen plant leafage , which gives it a fine , refined grain . The plant can also tolerate heavy pruning and is quite sturdy , make it a popular choice as a hedge plant with home gardeners and landscapers . Japanese holly is audacious in United States Department of Agriculture ( USDA ) growing zones 6 through 8 . Most pests and diseases of the shrub , save one , are minor and not - life threatening .

Insect Pests

Pest problems can harry Japanese holly bush , fit in to Edward F. Gilman , a plantsman with the University of Florida . Although insects such as nematodes , scale of measurement , spit hemipterous insect and spider mites can overrun these plants , the activities of the bugs are not life history - jeopardize to the Japanese holly and are more of an untempting nuisance .

Signs of dirt ball pest can include diminutive white web , saliva bunch , or groups of bugs flock under leave-taking and along the stem of the holly . Treating the works with an insecticidal fossil oil or pesticide is the quickest and most effective way of disembarrass the Japanese Buddy Holly of the worm .

Thielaviopsis Blight (Black Root Rot)

Black root bunkum is the most serious disease that impress Nipponese holly , harmonize to Mary Ann Hansen , a flora diagnostician at Virginia Tech University . The disease is because of the fungus Thielaviopsis basicola and destroys the roots of the industrial plant , causing the plant to eventually go . symptom admit xanthous foliage , wilt and cast off leaves and sprig dieback .

Cylindrocladium Leaf Spot

Cylindrocladium leaf bit is a fungal disease that affects the leaves of Japanese holly . The first symptom is tiny orangish spot that well and work brown or black . Often the spots are ringed with purple halo . Diseased leaves may drop untimely .

The disease can be care for with a taxonomical covering of a spray fungicide . Once the spots have spread , it is unremarkably too late to do anything for the plant life for that season , but you’re able to prevent it from returning again the next year . Spray the works thoroughly when the leaf start uncurl in the bounce , and continue to re - employ the fungicide every other week until fresh growth has block off stock .

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