Organophosphates

211.00 $
Published date: 2022/08/05
  • Location: Zxvzxv, xvxv, American Samoa, United States
insecticide, any toxic substance that is used to kill insects. Such substances are used primarily to control pests that infest cultivated plants or to eliminate disease-carrying insects in specific areas.


Insecticides can be classified in any of several ways, on the basis of their chemistry, their toxicological action, or their mode of penetration. In the latter scheme, they are classified according to whether they take effect upon ingestion (stomach poisons), inhalation (fumigants), or upon penetration of the body covering (contact poisons). Most synthetic insecticides penetrate by all three of these pathways, however, and hence are better distinguished from each other by their basic chemistry. Besides the synthetics, some organic compounds occurring naturally in plants are useful insecticides, as are some inorganic compounds; some of these are permitted in organic farming applications. Most insecticides are sprayed or dusted onto plants and other surfaces traversed or fed upon by insects.


Modes of penetration

Stomach poisons are toxic only if ingested through the mouth and are most useful against those insects that have biting or chewing mouth parts, such as caterpillars, beetles, and grasshoppers. The chief stomach poisons are the arsenicals—e.g., Paris green (copper acetoarsenite), lead arsenate, and calcium arsenate; and the fluorine compounds, among them sodium fluoride and cryolite. They are applied as sprays or dusts onto the leaves and stems of plants eaten by the target insects. Stomach poisons have gradually been replaced by synthetic insecticides, which are less dangerous to humans and other mammals.


Contact seller Share

Related listings

  • IPTV Smarters Player Review
    IPTV Smarters Player Review
    25.00 $
    Art - Collectibles Buhl (Idaho) 2022/08/13
    If you're looking for a simple way to watch live television, IPTV Smarters may be a great option at https://apkgenk.com/iptv-smarters-pro/. There are a number of subscription plans available and there is an app for Android, iOS, Firestick, and Smart ...
  • How To Download Ringtones For Mobile 2022
    How To Download Ringtones For Mobile 2022
    5.00 $
    Art - Collectibles Cohoe (Alaska) 2022/08/13
    If you're looking for new ringtones for your cell phone, there are plenty of options to choose from at https://klingeltonkostenlos.de/. From funny to classical, ringtones for mobile come in many genres, including animal sounds, classical melodies, an...
  • 5052 Aluminum
    5052 Aluminum
    211.00 $
    Art - Collectibles Arcade (Georgia) 2022/08/09
    Aluminum (Al), also spelled aluminium, chemical element, a lightweight silvery white metal of main Group 13 (IIIa, or boron group) of the periodic table. Aluminum is the most abundant metallic element in Earth's crust and the most widely used nonferr...

Comments

    Leave your comment (spam and offensive messages will be removed)