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BEAUVERIA BASSIANA in Agriculture/Horticulture Crops

Posted on | November 2, 2012 | No Comments

Beauveria bassiana is a fungus which causes a disease known as the white muscadine disease in insects. When spores of this fungus come in contact with the cuticle (skin) of susceptible insects, they germinate and grow directly through the cuticle to the inner body of their host. Here the fungus proliferates throughout the insect’s body, producing toxins and draining the insect of nutrients, eventually killing it. Therefore, unlike bacterial and viral pathogens of insects, Beauveria and other fungal pathogens infect the insect with contact and do not need to be consumed by their host to cause infection. Once the fungus has killed its host, it grows back out through the softer portions of the cuticle, covering the insect with a layer of white mold. This downy mold produces millions of new infective spores that are released to the environment.

Beauveria is a naturally occurring fungus in soils and has been researched for control of soil borne insects (e.g Root Borer, Pin Borer, White Grubs, caterpillar caterpiller, Heliothis, spodoptera, Diamond black moth, Leaf webber, American boll worm, semi loper, stem & fruit borer etc. Many soil insects, however, may have a natural tolerance to this pathogen, which is not exhibited in many foliar pests. Therefore, commercial development of this fungus for biological control has primarily been targeted against foliar feeding pests.

Safety

Beauveria products are reduced risk pesticides. Even so, applicators should wear

  long-sleeved shirt and long pants,

  shoes plus socks

  dust/mist filtering respirator (WP formulation),

  waterproof gloves, and

  goggles (ES formulations).

Restricted entry interval 12 hrs.
Preharvest Lnternval – 0 days (exempt from residue requirements)

Environmental safety is good. These products are generally non-toxic to beneficial insects, however, applications to areas where bees are actively foraging should be avoided. Beauveria products should not be applied to water, as they are potentially toxic to fish.

Use

Dosage : – Traps liquid400-500ml/Acre, to be dissolved in 200liter of water and then spray Note:Consult Manifacturer/Dealer for detailed clarification.

1) Powder (It can be in powder or liquid form) 1kg/acre dissolves in 200liter water&spray.

2) For tree crops like Apples, Pears, Mango, Citrus, Coconut, Leechi, etc.. To control Grubs scrach effected area, dissolve 5ml /liter applied thoroughly.

3) To Control Sugarcane, citrus etc. perennial crops root Grub dissolves 2kg in 200liter water & drench or given by drip.

The start and frequency of application varies with the pest and their susceptible life stages. In all cases, insect monitoring programs should be in place. For greenhouse management, it is recommended that treatment begin as soon as the insect pests are detected. Phytotoxicity has been minimal, but a small sample of targeted plants should be checked. After mixing with water, Beauveria products should be sprayed as soon as possible, as fungal spores die and material loses its viability overnight. The foliage should be sprayed until the plants are wet thoroughly, but not to run-off. Equipment that gets the material to the undersides of the leaves will result in prolonged activity, as spores are inactivated by sunlight. Evening applications may be desirable.

The frequency of applications also depends on the pest and the crop. For greenhouse pest problems, applications every 5-7 days are recommended. Again, all applications should be based on monitoring of pest populations.

The rate at which Beauveria spores kill their host is dependent on temperature Desirable 22 degree. It may take 7 to 10 days to kill larvae.

Compatibility with other pesticides

Beauveria products should not be tank-mixed with fungicides. Fungicides should not be applied within 24 hours of Beauveria applications. Beauveria products are compatible with a number of adjuvants and chemical and biological insecticides. But, as Beauveria products contain live organisms, some chemicals may have detrimental effects, and growers should contact the specific manufacturer or dealer for specific recommendations.

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