Pests And Controls

Question 1

Red/two spotted spider mite.

Answer 1

Symptoms - yellowish mottling of leaves, turns bronze, leaf may wither.
Colonies under leaves.
Fine webbing under leaves.

Control - Deltamethrin or fatty acids.
Predatory mite.

Question 2

Glasshouse whitefly.

Answer 2

Symptoms.
Can be seen, usually on underside of leaf.
Fly off in a cloud if disturbed.
Secrete honey dew -> sooty mould.

Treatment.
Parasitic wasp.

Question 3

Vine weevil.

Answer 3

Adults feed on leaves in spring and summer.
Larvae eat roots in autumn and winter.

Symptoms.
Adult damage - ragged edges if leaves.
Larvae damage often sudden collapse of plant.

Treatment.
Thiacloprid.
Nematode watered into compost.