These pesticides must not be used at the stage of flower growth.
Due to the different types of flowers and different stages of growth and development, the use of pesticides often cause drug damage to some flowers, light ones appear fallen leaves, serious ones lead to plant death, resulting in great losses. Therefore, for the ornamental plants which are sensitive to pesticides, it is particularly important to select pesticides correctly. The following is an introduction to the drug damage caused by common pesticides.
Stone sulfur mixture: it is harmful to peaches, plums, plums, pears and other plants. If it is used on these plants, spray it in the deciduous season, do not use it in the growing season or during the flowering and fruiting season.
Fenitrothion: fenitrothion is used to kill insects in high temperature season, which is harmful to pomegranate and cruciferous flowers to a certain extent.
Bordeaux liquid: peaches and plums are sensitive in growing season; pears, apricots and persimmons are prone to drug damage when the amount is lower than the multiple, and grape is prone to drug damage when the amount is higher than the multiple.
Dimethoate and omethoate: kiwifruit is particularly sensitive and should not be used; it can cause obvious drug damage to rose ornamental plants such as plum blossom, cherry blossom, elm leaf plum, pear, apricot and pear; dimethoate shrimp flower and coral flower are also very harmful. If omethoate is sprayed between June and October, it will often cause petals to wither and lose its ornamental value.
Dichlorvos: dichlorvos is obviously harmful to ornamental plants such as plum blossoms and cherry blossoms, as well as peaches, apricots, 20th century pears and Jingbai pears. Usually, other kinds of pesticides should be used. Dichlorvos also has varying degrees of drug damage to rhododendron, steamed bread willow, kiwifruit, Robinia pseudoacacia, walnut and so on. When using pesticides to control these plant pests, we should be very careful so as not to cause unnecessary losses.
Trichlorfon: it is harmful to cherry blossoms, plum blossoms and so on.