I can help with the question. Here's a breakdown of the information:
6.
(a) Four types of weeds poisonous to livestock:
- Hemlock
- Nightshade
- Water hemlock
- Milkweed
(b) The best stage of the life cycle to control weeds is when they are in the early growth stages before they have a chance to mature and spread seeds.
7. Disadvantages of using herbicides:
- Environmental pollution
- Development of herbicide-resistant weeds
11.
(a) Four herbicides for controlling weeds in maize fields:
- Atrazine
- Glyphosate
- 2,4-D
- Paraquat
(b) Weeds should be controlled with emergence herbicides early in the growth stage of maize when the weeds are just starting to sprout.
(b) Economic importance of weeds:
Weeds can reduce crop yields, increase production costs, and compete with crops for resources like water, sunlight, and nutrients.
Factors affecting herbicide selectivity:
- Timing of application
- Weather conditions
These details should help you better understand the types of weeds poisonous to livestock, the disadvantages of herbicides, herbicides for maize fields, the best timing for weed control in maize, economic impacts of weeds, and factors affecting herbicide selectivity. Let me know if you need more information or further clarification on any of these points.
