A summary of the use of these species is given by Griffiths (2003) and van Lenteren (2012).The application of these agents to the crops is carried out using inundative releases.The sachet consists of a small paper envelope, into which is placed breeding populations of both the predator and its prey, together with a farinaceous food supply for the prey, plus a small quantity of commercial, bulking substrate composed of bran flakes or vermiculite particles.
The present invention relates to a method for rearing and/or increasing the activity of at least one population of a predator mite species of the family Phytoseiidae, wherein at least one rearing population of a predator mite species of the family Phytoseiidae and a first food source for this predator mite species are provided, wherein the rearing population of the predator mite species and the first food source are both located in a common housing, which has at least one opening which allows individuals of the predator mite species to leave the common housing.
A successful ratio is best, often only, achieved if a reasonable breeding population of the agent can be established in the crop before the first pests invade.
However, if predators are introduced before the pest arrives, they will quickly die of starvation, especially if the crop itself is unable to provide nutrients, such as pollen or nectar. cucumbers, do neither have flowers with pollen, nor possess nectar sites, and so do not have an alternative nutrient source.
Thus, a major drawback with current biological programs for protected crops is that the factors, which influence the arrival of the first pest populations, are complex, and to date neither the commercial producer, nor the grower, has been able to reasonably identify the timing of this event.
Usually, predators are applied to the crop using the "sachet technique", which was invented by Griffiths (Sampson et al.
On small hectarages it will be done using hand held shaker bottles or blower machines.