Release purchased ladybugs only after sun down .
Ladybugs navigate by the sun, in the evenings they tend to stay
put.
In the warm months, it helps to chill the ladybugs in the fridge before releasing them. Ladybugs crawl rather than fly in colder temperatures and an overnight stay in the refrigerator won't harm them.
On heavily infested plants , drape a floating row cover or thin sheet over the plant and release the ladybugs underneath. Within a day, the ladybugs will have found the aphids and will be happily dining .