5 points about insect-pests and diseases
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Insect pests:
A thorough knowledge of morphology, nature of damage, vulnerable stage of pest, damaging stage, pre-disposing factors, susceptible stages of host, natural enemies and predators help in preventing and controlling them effectively.
All insects belong to the class Insecta.
Their body is segmented and mostly comprises three main segments, i.e., head, thorax and abdomen. Insects have two pair of wings and three pairs of legs.
According to structure of wing (pteron), they are classified into different orders, such as Coleoptera, Diptera, Hemiptera, Hymenoptera, Isoptera, Lepidoptera and Orthoptera, etc.
All these insects belonging to different orders may have different life cycles with different damaging stages and nature of damage.
Diseases:
Any abnormality in the normal functioning of a plant caused by pathogen, which is harmful to the plant or its parts or reduces its economic value is called ‘disease’.
It is the interaction between susceptible host and virulent pathogen in a favourable environment.
Symptoms of plant diseases are spot, blight, damping off, wilt, Dieback, necrosis, powdery mildew, rust, root knot nematodes, flower bud rot and leaf mosaic.
Hope it helps you! :)
Insect pests:
A thorough knowledge of morphology, nature of damage, vulnerable stage of pest, damaging stage, pre-disposing factors, susceptible stages of host, natural enemies and predators help in preventing and controlling them effectively.
All insects belong to the class Insecta.
Their body is segmented and mostly comprises three main segments, i.e., head, thorax and abdomen. Insects have two pair of wings and three pairs of legs.
According to structure of wing (pteron), they are classified into different orders, such as Coleoptera, Diptera, Hemiptera, Hymenoptera, Isoptera, Lepidoptera and Orthoptera, etc.
All these insects belonging to different orders may have different life cycles with different damaging stages and nature of damage.
Diseases:
Any abnormality in the normal functioning of a plant caused by pathogen, which is harmful to the plant or its parts or reduces its economic value is called ‘disease’.
It is the interaction between susceptible host and virulent pathogen in a favourable environment.
Symptoms of plant diseases are spot, blight, damping off, wilt, Dieback, necrosis, powdery mildew, rust, root knot nematodes, flower bud rot and leaf mosaic.
Hope it helps you! :)
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