PLANT PROTECTION 1 – Pests, Diseases and Weeds

PLANT PROTECTION 1 – Pests, Diseases and Weeds
What are insects?
Insects belong to the Class Insecta in the Phylum Arthropoda, the largest phylum in the Animal
Kingdom. Other classes in the Phylum Arthropoda are listed below.
PHYLUM ARTHROPODA
(Insects and Allied Pests)
The most important distinguishing features common to adults of the Phylum Arthroproda are:
1. Body is divided into segments.
2. Hard outer covering on body and limbs, with flexible joints for movement.
3. Paired limbs.
4. Bilateral symmetry (each side of the body is a mirror image of the other).
CLASS
INSECTA
CLASS
COLLEMBOLA
CLASS
ARACHNIDA
INSECTS
1. Three body segments.
2. Three pairs of legs on thorax.
3. Antennae present (1 pair).
4. Wings either present or absent.
SPRINGTAILS
1. Three body segments.
2. Three pairs of legs on the thorax.
3. Furcula on abdomen for jumping.
4. Wingless.
MITES, TICKS, SPIDERS, SCORPIONS
1. Two body sections.
2. Four pairs of legs.
3. No antennae.
4. No compound eyes.
5. Simple eyes present.
CLASS
MALACOSTRACA
CLASS
DIPLOPODA
PRAWNS, CRABS, BARNACLES, SLATERS
1. Two body sections.
2. Five or more pairs of legs.
3. Antennae present.
4. Usually sea dwellers, sometimes on land.
MILLIPEDES
1. At least 11 body segments.
2. Body round.
3. Two pairs of legs to each segment, no
poison fangs.
4. Antennae present.
CLASS
CHILOPODA
CENTIPEDES
1. At least 19 body segments.
2. Body long and flattened.
3. One pair legs to each segment, first pair
modified to form poison fangs.
4. Antennae present.
Insects and allied pests - Biology 9