When it comes to choosing herbicides, fungicides and insecticides for your barley crop, there are several options available to suit your particular crop protection needs. Different pesticides work in different ways. However, most pesticides fall into one of two categories: contact pesticides and systemic pesticides.
Contact pesticides control pests through direct contact. Insect pests are killed or disabled when sprayed directly with chemical or when they touch plant or soil surfaces covered in residual contact insecticide. Weeds are killed when enough of their foliage surface area is covered with a contact herbicide.
Systemic pesticides are absorbed by plants and animals and spread throughout the organism to attack untreated tissues. Systemic herbicides can kill weeds with only partial spray coverage, as the chemical can move within the plant to affect untreated tissues in the leaves, stems and roots. Systemic fungicides and insecticides move within the tissues of treated plants to kill certain insect and fungal pests.
Both contact and systemic pesticides can be delivered through foliar application or soil application, depending on the characteristics of the pesticide being used.
Seed treatments are one of the newest crop protection technologies available. They usually consist of a chemical or biological substance(s)—often including a fungicide or antimicrobial agent—applied to seeds or seedlings. Seed treatments are available to protect against insect pests, seed and soil-borne crop diseases, and even weather conditions like frost, drought and flooding.
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