Leslie from Reno, Nv writes
aphids pear scab
Mix 4 teaspoons of Insecticidal Soap Concentrate with 1 quart of water. Avoid spraying during full sun. Spray early in morning or evening orwhen overcast. Soap spray may cause marking of some varieties. If concerned about sensitivity of plants, apply to individual plants or small areas of plants and wait to determine if plant damage (phytotoxicity) occurs prior to treatment of larger areas.
Answer last updated on: 06/03/2013
