Flashcards in Pests Deck (30):
what is a pest
name 6 ways to control weeds
1. life cycle
3. before flowering
name 3 parts of insect
1. head 2. thorax 3. abdomen
name 5 elements adult insects all have
2. three body regions
3. 3 pairs of legs attached to thorax
4. one pair of antennae
5. 0,1 or 2 pairs of wings
what are the pores that insects breath through called?
what are 4 functions of exoskeleton
where do the legs and wings attach to?
what is wing adaptation elytra?
leather forewings of beetles
what is wing adaptation of hemelytra?
half membranous forewings of true bugs
what is wing adaptation of halteres?
reduced hind wings
what is wing adaptation of scaled wings?
what is parthenogenesis ?
virgin birth of eggs without fertilization eg aphids
what is moulting?
shedding of exoskeleton
what is instar?
- growth stage between molts
what is metamorphosis?
series of changes that organism passes in its growth from egg to adult
what are 3 main types of metamorphosis ?
1. no metamorphosis egg --> young--> adult
2. simple or incomplete egg --> nymphs -->adult
3. complete egg-->larvae-->pupa -->adult
what are characteristics in incomplete metamorphosis?
- nymph similar to adult but no wings or reproductive organs
- moult 3-5 times before adulthood
-eg grasshoppers, cockroaches, ect
what is the name for a water nymph
for bugs that undergo complete metamorphosis, what is the most destructive stag?
larvae ex catepillar
what are 2 classes for classification by feeding habit
2. sucking and piercing
what is a disease
process causing a disturbance in a plants normal growth and development
name 4 symptoms of disease
-wilting, chlorosis, necrosis, stunting
name 4 signs of disease
see structure of pathogen ex fungal spores, fruiting bodies ect
what is a saprophytic fungus?
-feeds on dead organic matter
what is a parasitic fungus?
-feeds on living organisms
what are spores?
- reproductive units moved by wind
-resistant to chemical controls
what are hyphae
-fine strands of fungus
a) what are bacteria? b) how do they enter an organism? c) how are the spread?
a) single celled organism
b) natural opening (stomata)
c) wind, rain, animals, contaminated tools
where do viruses reproduce?
only in living things