Can flowers also have allergic reactions to pesticides?

You have heard of people being allergic to pollen, but have you rarely heard of flowers being allergic to pesticides? Actually, it is true, and here is an introduction for everyone.

To prevent pesticides from causing phytotoxicity in many ornamental plants, first, other pesticides that cause no phytotoxicity should be purposefully used instead; second, the concentration used should be reduced as much as possible; third, pesticides should not be sprayed under high-temperature and high-humidity conditions, so that losses can be avoided. In addition, attention should be paid to the reasonable mixed use of pesticides.

The following are the harms of different pesticides to different flowers:

Dimethoate and omethoate can cause obvious phytotoxicity to ornamental plants in the Rosaceae family such as Japanese apricot, cherry blossom, cherry, ornamental peach, Elm-leaved Spiraea, Chaenomeles speciosa, apricot and pear; dimethoate is also very harmful to Justicia brandegeeana and Justicia carnea in the Acanthaceae family. If dimethoate is sprayed from June to October, it often causes petals to wither and curl, and leaves, inflorescences and small branches to fall off, losing their ornamental value. In addition, dimethoate also has a certain effect on cucurbit crops.

Dichlorvos: Dichlorvos has obvious phytotoxicity to ornamental plants such as Japanese apricot, cherry, peach, apricot and Elm-leaved Spiraea. Under normal circumstances, other types of insecticides can be used instead. Dichlorvos also causes varying degrees of phytotoxicity to rhododendron, Chinese willow, kiwifruit, Chinese pagoda tree, walnut and cucurbit crops. When using pesticides to control insect pests on these plants, great care should be taken to avoid unnecessary losses.

Trichlorfon: Trichlorfon causes phytotoxicity to cherry blossom, Japanese apricot, and the Golden Delicious variety of apple.

Rosin mixture: Using rosin mixture in summer causes obvious phytotoxicity to persimmon, and in spring and summer it has adverse effects on citrus.

Chlordimeform: When using chlordimeform to control flower pests, avoid using it on hibiscus and dahlia.

Thiophanate: When controlling pests and diseases of kiwifruit, avoid using thiophanate.

Petroleum emulsion: Petroleum emulsion easily causes phytotoxicity to certain peach varieties, and it should be used during the leaf-fall season.

Lime sulfur mixture: 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 should be sprayed during the leaf-fall season, and must not be used during the growing season or the flowering and fruiting period. Lime sulfur mixture also causes certain phytotoxicity to kiwifruit, grape, cucumber and leguminous flowers.

Fenitrothion: Using fenitrothion to kill insects in high-temperature seasons causes serious phytotoxicity to pomegranate, and also causes relatively great damage to cruciferous flowers.

Bordeaux mixture: Bordeaux mixture is sensitive to peach and plum during the growing season. Below the doubled formula, pear, apricot and persimmon are prone to phytotoxicity; above the equal formula, grape is prone to phytotoxicity.