Crown weevils were released at this site in 1995, these pictures show the decline in 8 years in density and vigor by insects alone. No other treatments were used.
Yanco 1998
Yanco 2003
Paterson's Curse & Vipers Bugloss
Leaf Mining Moth
Active in warmer months & limits seeding of secondary germinations in wetter years. Abundant no need to spread as throughout the range of the plant.
Crown Weevil Damage Crown Weevil
Life cycle is much the same as the plant. They emerge in March breeding through to October when that seasons adults emerge to feed on plants. They then go to ground until March to emerge then follow the same cycle. The Larvae feed in the crown of plant often killing it. Heavy grazing interferes with establishment.
Root Weevil
Same cycle as crown weevil but larvae are in the outer root of the plant.
Flea Beetle Flea Beetle Larvae
Flea Beetle
Also the same cycle as Weevils but eggs are laid in the root collar with larvae in the outer root. The most effective in grazing.
Stem Borer
Active in spring with larvae eating inner stem material.
Many thanks to www.northwestweeds.com.au for all of your continued support and permission of image use.