Which pesticides must be used with caution on flowers?

Which pesticides must be used with caution on flowers.

The pesticides that must be used with caution on flowers include the following:

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

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

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

Lime sulfur mixture: it is phytotoxic 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-fall season, and it must never be used during the growing season or during the flowering and fruiting period.

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

Petroleum emulsion: it is prone to causing phytotoxicity to certain peach varieties, and it is best used during the leaf-fall 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 under conditions of high temperature and high humidity.

Dimethoate and omethoate: kiwifruit is extremely sensitive and they must not be used; on Rosaceae ornamental plants such as Japanese apricot, cherry blossom, cherry, flowering peach, elm-leaved spirea, Chaenomeles speciosa, apricot and pear, they can all cause obvious phytotoxicity; dimethoate is also very harmful to Acanthaceae plants such as shrimp plant and coral flower, and if dimethoate is sprayed from June to October, it often causes petals to wither and curl and leaves, inflorescences and small branches to drop, losing their ornamental value; in addition, dimethoate also has a certain effect on cucurbits. Therefore, other types of pesticides may be chosen for the above ornamental plants.

Dichlorvos: dichlorvos causes obvious phytotoxicity to ornamental plants such as Japanese apricot, cherry, peach and apricot, elm-leaved spirea, and under normal circumstances other types of insecticides may be used instead; dichlorvos also causes varying degrees of phytotoxicity to rhododendron, twisted willow, kiwifruit, Chinese scholartree, walnut and cucurbits, and when using pesticides to control insect pests on these plants, great care and caution should be exercised to avoid unnecessary losses.

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

Lime sulfur mixture: lime sulfur mixture is phytotoxic 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-fall season, and it must never be used during the growing season or during the flowering and fruiting period; lime sulfur mixture also has a certain phytotoxicity to kiwifruit, grape, cucumber and leguminous flowers.

Fenitrothion: using fenitrothion to kill insects during the high-temperature season causes serious phytotoxicity to pomegranate, and also causes relatively great damage to cruciferous flowers.

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

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, its use on hibiscus and dahlia should be avoided.

Thiophanate: when controlling pests and diseases of kiwifruit, the use of thiophanate should be avoided.

Petroleum emulsion: petroleum emulsion is prone to causing phytotoxicity to certain peach varieties, and it is best used during the leaf-fall 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 under conditions of high temperature and high humidity. Only in this way can losses be avoided. In addition, attention should also be paid to the reasonable mixed use of pesticides.