Lecture 5 Part 1 Flashcards
End-use products contain one or several ____ and _____
Active ingredients and formulants
What is an active ingredient?
Substances or micro-organisms, including viruses, having general or specific action against harmful organisms on plants, parts of plants or plant products, and constituting a product to which is linked the pesticide’s effect.
What is a formulant?
Any substance or group of substances other than the active ingredient that is intentionally added to a pest control product to improve its characteristics
Pesticides are classified by their target organism, give two examples
- Herbicide for plants
- Fungicides for fungi
Plant protection product: products consisting of or containing active substances, safeners or synergists, and intended for one of the following uses: (5)
- Protecting plants or plant products against all harmful organisms
- Influencing the life processes of plants
- Preserving plant products
- Destroying undesired plants or parts of plants
- Checking or preventing undesired growth of plants
Broadly what are the three main reasons why fungicides are used?
- To control a disease during the establishment and development of a crop.
- To increase productivity of a crop and to reduce blemishes.
- To improve the storage life and quality of harvested plants and produce.
What is principle 5 of IPM
Principle 5 is to target-specificity and minimization of side effects of pesticides
What are the three main selection criteria for PPP’s
- Human helath
- The environment
- The Efficacy
In terms of efficacy as a consideration for selection of pesticide criteria what three main things do we need to take into account?
- MoA (Mode of action) Spectrum and risk of resistance
- PhMoA/PMoA (Physical mode of action) activity and use of pesticide
- Risk of resistance (Principle 7)
What do we consider in regard to the MoA?
Site and mechanism of action: cellular components subject to the fungicide action (target sites) and mechanisms that made the fungicide effective.
What are three types of MoA fungicides?
- Multi-site fungicides (have more sites and modes of action)
- Site-Specific fungicides (have only one site and one mode of action)
- Spectrum fungicides (range of fungi hit by the fungicide; could be broad spectrum fungicides or specific fungicides)
What does PMoA describe?
the effect of a fungicide with respect to the time of its placement in relation to the host-pathogen interaction.
What are the three main things that PMoA considers?
- Fungicide activity
- Fungicide localization with respect to the plant
- Duration and degree of the fungicide activity
what are the four activities in which fungicide activity considers?
- Pre-infection activity (preventative)
- Post-infection (curative)
- Pre-symptom
- Post-symptom (eradicant)
What are the two groups that fungicides can be broken up into?
- Protectant (non-penetrative)
- Systemic (Penetrative)
Penetrant fungicides are systemic to different degrees, what are they (4)
- Locally systemic
- Fully systemic
- Xylem systemicity
- Phloem systemicity
Five main attributes of contact fungicides
- Not Absorbed
- Not-mobile
- Preventative
- Multi-site of action
- No or few resistance
Five main attributes of penetrative fungicides
- Absorbed
- Mobile
- Preventative + curative
- Often single site of action
- Fungi can develop resistance