Several pesticides that should be prohibited or used with caution on flowers

Ornamental plants such as flowers are relatively sensitive to pesticides. If pesticides are used improperly, in mild cases there will be leaf drop, flower drop and fruit drop, and in severe cases the plants will die.

Dimethoate and omethoate: extremely sensitive to kiwifruit, so do not use; they cause obvious phytotoxicity to Rosaceae ornamental plants such as Japanese apricot, cherry blossom, flowering peach, elm-leaved spirea, Chaenomeles speciosa, apricot and pear. The above ornamental plants should not be treated with dimethoate or omethoate.

Dichlorvos: causes obvious phytotoxicity to ornamental plants such as Japanese apricot, cherry, peach, apricot, elm-leaved spirea, Twentieth Century pear and Jingbai pear, so under normal circumstances other types of insecticides should be used instead. When using pesticides to control pests on rhododendron, twisted willow, kiwifruit, Japanese pagoda tree, walnut and cucurbits, great caution should be exercised.

Trichlorfon: has phytotoxic effects on cherry blossom, Japanese apricot, and the Golden Delicious variety of apple.

Lime sulfur mixture: causes phytotoxicity to Rosaceae plants such as peach, plum, Japanese apricot and pear. If lime sulfur mixture is used on these plants, it is best to spray during the leaf-drop season, and it must never be used during the growing season or the flowering and fruiting period.

Bordeaux mixture: sensitive for peach and plum during the growing season; when below the dilution multiple, pear, apricot and persimmon are prone to phytotoxicity, and when above the dilution multiple, grape is prone to phytotoxicity.

Petroleum emulsion: easily causes phytotoxicity to certain peach varieties, so it is best used during the leaf-drop season.

In order to prevent pesticides from causing phytotoxicity to many ornamental plants, first, purposefully switch to other highly effective pesticides that cause no phytotoxicity; second, reduce the concentration used as much as possible; third, do not spray pesticides under conditions of high temperature and high humidity.