Flashcards: cprt chemical aprt 2

Absorbed by plants or animal hosts and transfer to untreated tissues.

penetrate plant tissues and move through the vascular system killing weeds with partial spray coverage.

systemic herbicide examples

on the other hand, are generally post-emergence and can either be translocated (systemic) throughout the plant or at a specific site.

Must come into physical contact with the pest to be effective. Upon contact, the pesticide enters the body of pests via their epidermis and causes death by poisoning.

control or suppress individual plants without affecting the growth of other species.

kill all kinds of weeds.

Stomach poisons enter the pest's body through their mouth and digestive system and cause death by poisoning. • They are applied as sprays or dust onto the leaves and stems of plants and eaten by the target insects

are chemicals or biological agents that kill or inhibit fungi, including the fungal-like organisms like the Oomycetes.

pesticides that form poisonous gases when applied. They enter through the insect spiracles and cause death by poisoning. Some of their active ingredients are liquids when packaged under high pressure but change to gases when released

Chemicals that inhibit but do not kill fungi (only inhibit its growth, sporulation, or spore germination) are also called

Soil fumigants commonly used as

do not kill but are distasteful enough to keep pests away from treated areas/commodities. They also interfere with pest's ability to locate crop.

contain living microorganisms (bacteria, fungi) that are antagonistic to plant pathogens.

chemicals used for destroying unwanted vegetation or weeds

extensively translocated in the plant through the vascular system and water, nutrients, and other materials from absorption to action sites.

- kill only the portion of plant tissue in contact; therefore, it must be applied uniformly to be effective. These are comparatively fast-acting herbicides

are synthesized from organic and inorganic chemicals

are non-selective herbicides applied to the soil before planting.

are applied before the weed seedlings emerge through the soil surface.

are applied after weed seedlings have emerged through the soil surface. Must not be made when there is rain making them ineffective

are applied to the soil and are used as pre-plant or pre-emergence treatment.

Eco guard contain

Bio-Trek 22G contains

Serenade, a bio-organic fungicide with

are effective only when applied before the fungal infection occurs.

can eradicate a fungus after it has caused the infection and curing the plant.

t fungicides remove pathogenic fungi from the site of infection.

These chemicals eradicate the host's dormant or active pathogen. They remain useful on or in the host for some time.

are pesticides that kill rodents that include rats and mice, and squirrels. • usually formulated as baits, designed to attract animals.

allows quick in killing rodent pests, but rats develop bait shyness

Kills rodents slowly. Cause internal bleeding after several days of feeding to the poison. It needs repeated ingestion for several days leaving the rodents to grow weaker daily

Molluscicide

highly toxic to other animals and humans, also acts as a contact poison

rapid reappearance of a pest population in injurious numbers, usually brought about after applying a broad-spectrum pesticide that has killed the natural enemies that normally keep a pest in check

Pests become resistant to pesticides and are useful only for a short period. In this case, the pest mutates and becomes immune to a substance, so it no longer affects it calls for the use of another pesticide

pesticides stay in the environment for long, accumulates in the food chain, and animals at the top like humans have a greater chance of toxicity due to pesticides' build-up in their system