Introduction
Bacillus Thuringiensis, often abbreviated as Bt, is a gram-positive bacterium that has revolutionized the world of organic farming. First discovered in 1901 by a Japanese entomologist, it is renowned for its natural insecticidal properties, making it a valuable ally in the fight against crop pests. This article explains what Bacillus Thuringiensis is and how it is used to protect our crops, highlighting the benefits of this ecological and safe method.
What is Bacillus Thuringiensis?
Bacillus Thuringiensis is a bacterium that produces crystalline proteins (endotoxins) that are toxic to many insect larvae. These proteins attack the larvae's digestive systems, leading to death within a few days. Bt is particularly effective against the larvae of butterflies (Lepidoptera), beetles (Coleoptera), and mosquitoes (Diptera). Unlike conventional chemical insecticides, Bt is highly specific to its targets, meaning beneficial insects like bees and other pollinators are not harmed.
Use of Bacillus Thuringiensis in Crops
Bacillus Thuringiensis is used in a wide variety of crops, including vegetables, orchards, and ornamental plants. Its versatility makes it suitable for:
Vegetable Crops: Tomatoes, potatoes, cabbage, and other vegetables benefit from Bt to prevent pest damage.
Orchards: Apples, peaches, and other fruits can be protected from larvae that might otherwise affect the quality and quantity of the harvest.
Ornamental Plants: Flowers and decorative shrubs are often attacked by pests that diminish their beauty and vitality. Bt offers a non-toxic solution to keep plants healthy.
Benefits of Bacillus Thuringiensis
One of the main advantages of Bt is its biological composition without chemical additives, making it safe to use around small children and pets. Additionally, Bt is non-toxic to humans and animals, allowing it to be used in home gardens or on balconies without health concerns.
Other benefits include:
Environmentally Friendly: Bacillus Thuringiensis is biodegradable and leaves no harmful residues in the environment.
Selective: It targets only the pest insects, sparing beneficial insects.
Approved Applications and Usage Instructions
To get the most benefit from Bt, it’s important to prepare the solution right before application to avoid waste and residues. Treatment should be carefully planned, taking into account the area or number of plants to be treated and following the preparation instructions precisely. The product should be applied when the first larvae appear, ensuring a three-day safety interval between the last treatment and harvest.
For strawberries, vegetables, and other plant products, Bt should be applied after the mature products are harvested, and a three-day waiting period should be observed before the next harvest. It’s advisable to avoid application during windy conditions and not to mix Bt with other plant protection products. After treatment, wait 24 hours before re-entering the treated area or performing further work.
Biological insecticide
Larvicide against various insects
Versatile use in different crops grown.
Safe and non-toxic use
Preparation and Application of Bacillus Thuringiensis
To prepare the solution, fill the sprayer with the amount of water specified in the table on the product leaflet. Carefully add the contents of the single-dose sachet to the water, avoiding dust formation. Mix or shake well until a homogeneous suspension forms. The mixture should be distributed within 12 hours of preparation using standard volume pumps.
Method and Equipment for Application
The mixture should preferably be applied during the cooler parts of the day using the following equipment:
Manually or motor-operated backpack sprayers: Ideal for treating vegetable crops, fruit trees, and gardens.
Hand-held sprayers or backpack sprayers with a tank connection: Suitable for treating vineyards and olive groves.
Conclusion
Bacillus Thuringiensis is an eco-friendly and safe solution for protecting crops from various pests. Thanks to its effectiveness against the larvae of numerous insects and its environmental safety, Bt is an ideal choice for farmers and gardeners who wish to reduce the use of chemical pesticides. By using Bt, we can not only protect our plants but also contribute to more sustainable and environmentally friendly agriculture.