Q1. Differentiate between chemical and biological method of weed control. [1pt.] Also give one example of each.
Q2. Name the two modes for using pesticides.
Q3. How can the crops be protected from :
a.Rodents
b. Insects
c. Bacteria
d. Birds
e. Big animals
Q4. Give 2 advantages and disadvantages of modern day agriculture.
Answers
1)Biological method:-involves the deliberate use of insects or some other organisms which consumes and specifically destroy weed plants.
example:-
1)Bioagent:-Two beetles=Octotoma scabripennis and uroplata giraldi
*Weed:-Lantana camara
B)Chemical method:-involve the use of chemical weed killers called herbicides such as 2,4-P,atrazine, fluchloralin, and isoproturon to kill the weeds.
2)•Larvicides and Adulticides — Organophosphates. Organophosphorus insecticides affect the nervous system. ...
•Larvicides — Growth Regulators. These chemicals are typically referred to as insect growth regulators or IGRs. ...
•Larvicides — Bacteria. Bacillus thuringiensis var. ...
Answer 2:
Pesticides can be grouped according to the types of pests which they kill:
Insecticides - insects.
Herbicides - plants.
Rodenticides - rodents (rats and mice)
Bactericides - bacteria.
Fungicides - fungi.
Larvicides - larvae
Answer 3 :
Crop protection is the science and practice of managing plant diseases, weeds and other pests (both vertebrate and invertebrate) that damage agricultural crops and forestry. Agricultural crops include field crops (maize, wheat, rice, etc.), vegetable crops (potatoes, cabbages, etc.) and fruits. The crops in field are exposed to many factor. The crop plants may be damaged by insects, birds, rodents, bacteria, etc. Crop protection encompasses:
Pesticide-based approaches such as herbicides, insecticides and fungicides
Barrier-based approaches such as agrotextiles and bird netting
Animal psychology-based approaches such as bird scarers
Biotechnology-based approaches such as plant breeding and genetic modification