Which pesticides are used to control wheat aphids:
(1) acetamiprid. It is recommended to use a dose of 0.6 to 0.9 g of active ingredient per mu. The technical points of use are: spray application at the initial stage of aphid at the wheat ear stage.
(2) Resistance to Converse. The recommended dosage is 5.0 to 7.5 g of active ingredient per mu. The technical points of use are: spraying at the beginning of wheat seedlings or spikes.
(3) cyhalothrin. It is recommended to use a dose of 0.5 to 0.6 g of active ingredient per mu. The technical points of use are: spray application at the beginning of wheat seedlings. Because pyrethroid pesticides have a greater lethal effect on natural enemies, it is not suitable for use in controlling aphids at the ear stage.
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Washer, machine component that is used in conjunction with a screw fastener such as a Bolt and nut and that usually serves either to keep the screw from loosening or to distribute the load from the nut or bolt head over a larger area. For load distribution, thin flat rings of soft steel are usual.
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