Magnolia Scale - Ask Extension
I have discovered Magnolia Scale on a 35 year old plant. Investigation indicates a three prong approach...
First, now use insecticidal drench; secon...
Knowledgebase
Magnolia Scale #875243
Asked June 29, 2024, 1:52 PM EDT
I have discovered Magnolia Scale on a 35 year old plant. Investigation indicates a three prong approach...
First, now use insecticidal drench; second, in late august and mid September, insecticidal spray and third, in early spring, a dormant oil spray. Can you recommend the best soil drench product for the Magnolia's treatment?
Warren County Ohio
Expert Response
Babara
Because of the life stages of magnolia scale, it is likely that the best treatment would be to apply insecticides when the insects are in the freshly settled crawler stage. This is usually in late August to early September. Sprays applied before the crawlers are present or after they have become dormant in the overwintering stage will have little effect.
Next May you could also apply soil drenches with systemic insecticides. Always read and follow label instructions.
https://ohioline.osu.edu/factsheet/ENT-61
For more specific information on treatments check out:
https://bygl.osu.edu/node/1803
All the best, Roxanne
Because of the life stages of magnolia scale, it is likely that the best treatment would be to apply insecticides when the insects are in the freshly settled crawler stage. This is usually in late August to early September. Sprays applied before the crawlers are present or after they have become dormant in the overwintering stage will have little effect.
Next May you could also apply soil drenches with systemic insecticides. Always read and follow label instructions.
https://ohioline.osu.edu/factsheet/ENT-61
For more specific information on treatments check out:
https://bygl.osu.edu/node/1803
All the best, Roxanne
