Scale insects feed on shrub ' sap using their foresightful , pierce mouthparts , causing twig and branch dieback and sometimes killing the plants . scale leaf insects also release a sticky liquid called honeydew , which promotes the fungal disease contraband jet-black mold . Scale louse are difficult to get rid of , as they ’re immune to insect powder when they ’re adults and can be controlled by chemicals only when they ’re in the " creeper " stage . you may control scale of measurement infestation on your shrubs by utilizing natural scale predators , by spray the shrubs with horticultural oils , by lend oneself insecticidal scoop or by spraying the shrubs with approved insect powder .
Step 1
Inspect your shrub for scale nightwalker . Hold a slice of paper beneath the ramification and shake the limbs to see crawl scurf worm fall off . Scale insect are tiny , so you may require a magnifying deoxyephedrine to study them well .
Step 2
Introduce natural musical scale predators , such as ladybugs and tiny parasitical WASP . you could release the parasitical wasps or ladybeetle onto your shrubs , and they ’ll feed on the exfoliation worm . free the rude predators at the time of day and under the term recommend by the party from which you buy them .
Step 3
Spray your shrubs with horticultural petroleum , or paraffinic oil , after the scale crawlers think up . Spray the oil munificently over the shrub to coat the entire works .
Step 4
Apply an insecticidal soap to the shrubs ' leaves when the shell insects are in the crawler stage . duplicate the software about 10 days after .
Step 5
care for your shrubs with an approved insecticidal spray , such as carbaryl , acephate , malathion or chlorpyrifos . Ensure that the insecticide is approved for the scale insects you have and the types of shrubs that are infested . hold the insect powder when the shell louse are in the crawler level .
Tip
Spray your shrub with dormant horticultural oils before bud interruption in other spring , usually in March or April . The dormant vegetable oil will kill the over - overwinter weighing machine insects on the shrubs .
Warning
Always watch over the instructions on the recording label exactly when you ’re apply horticultural oils or insect powder . Wear gloves , eye protection and a respiratory mask when manage or spray these chemicals .
Things Needed
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