According to Auburn University , the most vulgar pest problems to affect hydrangeas admit Japanese beetle , red wanderer mites , aphids , foliage tiers , rose chafers and oyster scale . Each of these pests leaves distinguishable signal on a hydrangea , so diagnosing the pest problem is unproblematic . Once you have specialise down the plague based on the sign , use a pest remedy to rid your hydrangea bushes of the problem .
Hand Control
Step 1
Mix detergent in a bucket with a garden hose . Add approximately 3 tbsp . of detergent per gallon of water system to make a solution that is 2 per centum in strength .
Step 2
locate the bucketful of buttery water next to your hydrangea bush .
Step 3
Hand - pick Nipponese beetles and rose chafer mallet off of your hydrangea bush , and fox them into the bucket of soapy urine .
Step 4
Squish any rolled or sandwiched leaves to kill any caterpillars nesting in the leaves . These Caterpillar , known as leaf tiers , nest in the stacked and drift leave , eventually killing them .
Aphids
study your hydrangea for preindication of aphids . Ants crawling on hydrangea leaves are often a signaling of aphid plague . If you see emmet , turn over the youngest leaves of your plant life . The presence of small , pear - shaped , yellow or gullible insects means that you have an aphid infestation .
Mix an insecticidal soap according to the directions on the software system . you’re able to buy insecticidal easy lay at a garden center .
Place the insecticidal soap mix into the holding sleeping room of a garden hosiery spray applicator .
Attach the garden hosiery to the atomiser applicator .
Step 5
Spray your hydrangea scrub with the insecticidal liquid ecstasy every two to three years , until the aphid are gone .
Oyster Shell Scale
reckon on the upper ends of the stems for mark of oyster shell scale . exfoliation insects are typically covered with waxy shell that protect the insect while they bung . louse may come out to be livid , lily-livered , browned or grim and will measure around 1/10 in in diameter .
buy horticultural fossil oil from a garden pith . Mix the oil harmonize to package counselling .
stream the oil into the holding chamber of a pressurize nebuliser applier .
Prime the applicator by grasping the grip and pump up and down .
dig the holding sleeping accommodation with one deal and the applicator wand with the other . open up the spray valve on the applicator wand , and hold the mixed bag straightaway over the oyster plate scale . The oil will coat the hemipteran and smother them without harming the plant .
Tip
wanderer mite are typically a problem during hot , dry atmospheric condition . Though the mites are difficult to discover , the comportment of webbing , as well as distort ontogenesis among new shoots , are indicators of spider mites . The mites can not be controlled by insect powder . The only direction to ensure them is to water your hydrangea well to keep it good for you .
Warning
Always wear protective clothing when blend chemical substance or horticultural oil .
