- The whole cabbage family, for example cauliflowers, turnips, kale, rape, Brussels sprouts, broccoli, watercress, but the main host plants are cabbages. Sometimes mustard plants and ornamental cultivated plants can be infested, such as sweet alyssum, wallflower, candytuft and stocks.
About Diamondback moth
- Adult moths are nocturnal, 8mm in length, grey/brown, long and thin in shape with diamond markings on their backs.
- They often migrate to this country in large numbers from mainland Europe.
- The green caterpillars grow to 12mm in length and are thicker in the middle of their bodies.
- This moth goes through four larval stages before pupating and becoming an adult, over a 15-30 day period.
- Plant damage is only caused by the caterpillars, with the last stage causing the worst damage.
- Plants are often stripped bare by heavy infestations.
- Caterpillars pupate in loosely spun silken cocoons attached to the undersides of leaves.
- It is the pupal stages that overwinter, although up to six generations can occur each year.
- Adult moths emerge in May to mate and lay shiny, yellow eggs. Eggs are 1mm in width and are laid on leaves singly or in pairs.
- If threatened, caterpillars drop off the leaves and hang by a thread.
Products containing the following chemical ingredients are all effective on Diamondback moth
- Pyrethroids and Pyrethrin
Note: It is important to read manufacturer's instructions for use and the associated safety data information before applying chemical treatments.
- Encourage natural predators and parasites.
- Regular observation of crops to check for damage or infestation.
- Crop containment, for example, grow in polytunnels, greenhouses or under fleece.
- Companion planting with marigolds or onions.
- Avoid sowing crop at peak breeding times.
- Water foliage regularly as larvae can be easily drowned.
- Thoroughly check, and remove infested plants.
- Use sticky traps to monitor the first appearance of adult moths.