When thrip or aphid insects blow in at Riverview Flower Farm we use Alsa once per week, a garlic extract, to control these pests. We add it to irrigation water that is applied to the soil at the top of the pot through our drip irrigation system. It is in a solution of the 8 ounces of water we give each gallon pot on hot sunny days when pests are in the plants. This is absorbed into the plant roots and translocated throughout the plant and flowers and stays active for about a week.
Alsa is a natural crop protection product that relys on the odor and taste compounds derived from garlic. These compounds, effective against harmful insects such as thrips and aphids, are present in garlic and effective when they are correctly dissolved in oil.
When garlic extract is applied, the scent and flavor of your plant changes in such a way that insects no longer find it attractive. The insects become restless and leave their hiding-place. Natural predators are then much more effective in the fight against pests. Preventative use of garlic extract ensures your plant remains in healthier condition. Garlic extract is not 100% effective and no pesticide is but it significantly reduces the use of synthetic Chemicals so there is less impact on the environment.
Garlic extract remains active in the plant for approximately 7 to 10 days. After this active period, the compounds are transformed within the plant which are recycled and used in natural plant metabolism. Thus, weekly doses of garlic extract are recommended when you have thrip or aphid infestations. Garlic extract can be used on any plant, any stage of growth, and cannot be mistakenly over-used. Garlic extract is natural and safe.
Chili thrips are a problem on roses in hot weather. Garlic extract disrupts their destructive feeding tendencies. You will find ready to use garlic extract in stores and online. Homemade garlic extract recipes are easily found with a Google or Bing search. Look for ones that recommend soil drenching for absorption by the plant roots. The trick is to allow the crushed garlic to steep in the oil long enough to release effective levels of odor and taste compounds. Pay attention to their cautions and warnings so you are not destroying beneficial insects or your plants by misuse. You can learn much more reading these books by Jeff Gillman.