LO 1.1 Thrips and Scale Insects Flashcards
Question
What are Thrips?
Thrips
Thrips are tiny insects (<1mm)
* Cigar shaped
Fringed wings (weak flyers)
Many are pests of greenhouse crops
* Few natural predators so….
* Numbers can increase very rapidly
Some pass on plant viruses
Thrips
Info Graphic
Thrips, male and female.
Thrips
Thrips
Info Graphic
Thrips have an Incomplete metamorphosis.
True or False.
Thrips
True
Incomplete metamorphosis.
Thrips
Info Graphic
Thrips damage
Thrips
Western Flower Thrips oviposition‘blisters’ caused when eggs are laid into leaf tissue.
Thrips
Question
What are some feeding and symptoms of Thrips?
Thrips
- They cut a hole into plant epidermal cells
- Saliva is injected
- Semi-digested food is then sucked up from ruptured cells.
- This process leaves cells destroyed or collapsed, and a distinctive silvery or bronze scarring on the surfaces of the stems or leaves where the thrips have fed.
Thrips
Question
What are some Thrips controls?
Thrips
Cultural - any suggestions?
Biological - Predatory mites » on plants or in soil.
* Lacewing larvae
* Orius sp. (flower bug)
Chemical (last resort)
Thrips
Question
What are Scale insects?
Scale insects
Scale insects
* Dramatically variable in appearance.
* Adult females typically have soft bodies and no limbs, and are concealed underneath domed scales, extruding quantities of wax for protection.
Scale insects
Info Graphic
The Cottony cushion scale
Scale insects
- Icerya purchasi is a pest on Citrus fruit trees
- Wax makes them hard to control
- Young scales protected under mother
Scale insects
Info Graphic
Some more Scale insects
Scale insects
Mealy bugs
Scale insects
Study Card
Scale insects
Some facts
Scale insects
Scale insects
* About 8000 sp.
* Females are sedentary - Cannot move - Little or no segmentation - No clear head, thorax or abdomen.
* Males, if they occur, can fly - Look more like aphids(top right)
Scale insects
Study Card
Scale insects - Life Cycle
Some facts
Scale insects
Scale insects - Life Cycle
Scale insects
Question
Scale insects control?
Some facts
Scale insects
Can be very difficult due to protective scales and wax.
Cultural - Any suggestions?
Biological - Cryptolaemus (Ladybug)
Chemical - Systemic is best.
Scale insects
