Yes, the Sevin Concentrate is safe to spray on apple trees. You would mix 3 oz. of Sevin Concentrate with a gallon of water and spray the upper and lower leaf surface and between fruit clusters and on small limbs and trunksto the point of runoff where pest appear. Repeat applications as needed fo up to 8 applications per year. To avoid undesired apple thinning delay use until at least 30 days after full bloom.
According to the label, yes it can be used on roses.
For Roses: Mix 1.5 fl. oz. of product per gallon of water and spray upper and lower leaf surfaces and small trunks, stems and twigs to the point of runoff where pests appear. Repeat applications as necessary up to a total of four times per year for trees and six times per year for ornamental shrubs and flowers, but not more often than once every seven days.
No, Sevin Concentrate will not harm hibiscus flowers.
Sevin Concentrate can be applied up to 6 times per year, but no more often than every 7 days.
You will usually want to spray Sevin Concentrate in the morning or evening when pollinators are not present and the treated plants are not under the extra stress of mid-day heat and sunlight. Be sure to follow the product label directions for the pest and plants you are treating.