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whiteflies on cannabis

Whiteflies on cannabis

  • First stage: Approximate size of 0.25mm. The larva feeds on sucking sap from the plant. Only in this stage the larva is capable of moving, the other three are sessile, i.e. the nymph is enclosed in a capsule to protect itself while its structure changes.
  • Second stage: Approximate size of 0.4 mm. The formation of six legs can be seen on the larva.
  • Third stage: Approximate size of 0.5 mm. Transparent appearance.
  • Fourth Stage: Some organs, like the eyes, appear at this stage. Its thickness and size increase. Normally, this nimphal state is called “pupa”; the adult emerges from its protective capsule through a T-shaped slot – normally in the morning – starting to fly immediately.

As active substances against the White-fly, and among others, we find Butocarboxim, Buprofezin, Imidalclopid, etc.
Their body consists of three parts: head, thorax and abdomen. As other insects, they’ve six legs and also a pair of white wings. As already mentioned, they?ve biting-sucking mouth parts thanks to which they can feed on the sap of young leaves and tissues.

We see as it is a pest that likes high temperatures and relatively humid ambient, that?s why the summer is their favourite season and greenhouses and in growing-boxes their favourite habitat. From the egg laying until the birth of the larva they spend approximately 24 hours: then the larva need more less four weeks to become adult, passing through 4 larvarl-nymphal stages in flake form and located on the underside of the leaves.

  • Cales Noacki: Small wasp that parasites whitefly larvae. Very effective, although it isn?t commercialized on the market.
  • Encarsia Formosa: especially effective in greenhouses. Small fly of just 1mm of black colour with transparent wings. As the Cales Noacki, it lays its eggs (parasites) in White-fly larvae. It reaches its maximum predatory efficiency at a temperature of 25-27ºC and 50-60% relative humidity, using 10 predators per m2.
  • Macrolophus Caliginosus: useful also to combat other pests like spider mites. They attack Whiteflies in all their stages, preferring eggs and larvae.
  • You can also use other predators, like fungi: Paecilomyces fumosororeus, Beauveria Bassiana, etc.

As a last resort, and always avoiding their use for the sake of our environment, we can use chemicals to eradicate a Whitefly pest. These treatments will be especially effective against the larvae, which tend to be more sensitive to these substances. It should be noted that Whiteflies have a great capacity to develop defenses against these products, so we should alternate the use of several active principles to get maximum effectiveness. We should always choose insecticides respectful with the natural enemies of the plague that we are going to treat, limiting their use to the most and always as last resource, since a biological crop is always better.
Reproduction of the Whitefly, egg laying
As in most pests and diseases that may affect the different strains of marijuana, prevention is basic to reduce the chances of possible attacks and infections. We can rotate our plants with others, thus creating an association of beneficial plants: growing Marigolds, Chinese Carnations or Basil will help to prevent the appearance of whiteflies because its smell repels them. We must check the underside of the leaves regularly looking for adults or larvae, and use an organic insecticide like potassium soap or Neem oil every few days. The use of sticky traps, in which adult insects will be sticked, will make things more difficult for them.

If these remedies don?t work – or if we don?t want to use them for any reason – we can combat the White-Fly with different natural predators. Some of the most effective ones are:

Whiteflies are small flying insects that can ruin any crop if they have favourable reproduction conditions. In this Post we explain a little more abou

Whiteflies on cannabis

1.) Insecticidal soaps

2.) ​Neem Oil
Proven White Fly Remedies

An infestation can get out of control if you ignore it! The eggs they lay are practically glued to the plant, so you can’t wipe them off.
Spinosad is an organic insecticide made from the fermentation of a specific soil bacteria (actinomycete Saccharopolyspora spinosa) and kills whiteflies via ingestion or contact by effecting the insect’s nervous system. Spinosad can be a good choice for organic and outdoor growers, because it is very toxic to whtieflies, but is less toxic to many beneficial insects and spiders.
They look like tiny moths flying around your plants
4.) Essentria IC3
Note: Most spinosad products are effective for only about 24 hours after being mixed with water, so only mix as much as you will need per application. Anything left over will be waste.

3.) Spinosad

Learn how to identify and get rid of white flies and prevent this common indoor plants pest from ever attacking your cannabis again.