Moths emerge from the overwintering pupae in mid-spring and lay eggs on leaves, which hatch quickly. The larvae will feast for up to a month, then pupate for about 10 days in cocoons attached to branches and leaves. There are up to four generations per season.
Search and destroy eggs on the undersides of leaves. Handpicking of worms and adults is feasible and should be done several times weekly if their presence is detected.
Insecticidal soaps will also help keep their populations under control, but must be applied on a regular basis in heavier infestations. Neem Oil and Neem based products are also effective .Bt Bacillius thuringiensis has proven effective against almost all species of Moth and worm , it is a bacterium / organic pesticide that is readily available to home gardeners. It's harmless to people and pets. Apply it at either bloom or petal fall, or both. Bt It is a stomach poison and must be ingested . It is more effective when applied during warm, dry weather while the larvae are actively feeding. Bt breaks down quickly in nature so multiple treatments per season are necessary.
Bt should be applied at either bloom or petal fall, or both. Bt is not generally harmful to beneficial insects. It is a stomach poison and must be ingested by the caterpillar and is effective when applied during warm, dry weather while the larvae are actively feeding. Requires more than 1 treatment
Diverse gardens that include a symbiotic mingling of flowers and vegetables, they are a poor environment for insect pests, but also attract many natural predators. Encourage natural predators such as predatory wasps by mingling varying plants and flowers blooming at different intervals throughout the season. Native parasitic wasps are known to be advantageous in controlling cabbage looper populations.
Floating row covers in the spring are helpful, but need to be removed by mid May. The row covers create a barrier that keeps insects out but allows for moisture, light and air circulation. In keeping insects out, it also bars pollinators.
Use Broad-spectrum insecticides, such as pyrethin only as a last resort.
Bio Pesticides such as Neem derived products and Spinosad , another biopesticide , harmless to humans are advisable. Spinosad will interfere with pollinators as well as pests - evening / night time use is advisable. Broad-spectrum insecticides, such as pyrethrin or malathion only as a last resort.
Sprays/Pesticides must be applied in the pre-bloom stage to prevent injury. Pesticides such as pyrethroids that are more effective in cool than warm weather will work more efficiently against worms earlier in the season, and is the recommended early season chemical treatment for most worms and caterpillars.
Diazinon can be applied at petal fall, but is not as eco-friendly as the bio-pesticides listed above as it is toxic to beneficial insects and pollinators. Other Broad-spectrum insecticides, such as pyrethrin or malathion only as a last resort, generally used commercially and not really advisable for smaller plantings or home gardeners.
Sprays/Pesticides must be applied in the pre-bloom stage to prevent injury. Pesticides such as pyrethroids that are more effective in cool than warm weather will work more efficiently against Cabbage Looper earlier in the season, and is the recommended early season chemical treatment for most worms.
Proper sanitary practices are vital to the health of your garden. Proper sanitation can help to ensure disease-free pest-free and productive gardens. Try to keep the garden free of any diseased dead or damaged plant materials. Remove cuttings from pruning and trimming and either destroy them - if diseased, or send them to the compost pile. Leaving rotting fruits and vegetables in the garden is like a written invitation to unwanted pests and diseases.
If a diseased or dead plant part has to be cut, the microorganism that caused the problem is probably on the tool you just used. Like a surgeon, sterilize all tools by washing in soap and water - rubbing alcohol wouldn't hurt either. If you pinch off diseased plant parts, wash hands before handling any other plants. Keep Weeds under control. Till the soil in the spring before planting to expose and kill larvae that wintered over in the soil.