Fruit and Vegetables

Red Rodilegno

Red Rodilegno

The red rodilegno is an insect, of the order of the lepidoptera, which belongs to the Cossidae family. The Cossus cossus has an average life span of about 3 years showing a large reproduction during the summer period. The larvae have a length of about 80 millimeters and have a color varying between pink and purplish-red, depending on the stage of development of the insect. The larvae have eight pairs of legs and begin to dig the tunnels after 12 days from birth, where they will then spend the winter to resume normal development the following spring. When the larval stage ends, the insects come out of the channels that have been dug to make a cocoon, from which the butterflies will come out after 30 days. Adults have a gray-white color with streaks.

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The fight against Cossus cossus involves diversified practices depending on the cases that must be treated. The guided struggle involves the monitoring of adult individuals through the use of sexual traps, which should be installed in the first half of May. To be able to adequately prevent the infestation, the woody parts of the plant should be treated with phosphorganic insecticides, mixed with white oils, in order to improve product penetration and ensure greater persistence on the plant. In the presence of infestation, larvae should be eliminated both by mechanical and chemical means, for example by blowing aerosols into the tunnels, saturating them and subsequently filling the opening.Biological struggle

The biological fight against this particular type of insect consists of 2 different methodologies, the first involves the use of antagonistic microorganisms, the second the capture of male specimens. The capture of the male specimens takes place with pheromone traps, in order to ensure that the females are not fertilized and the eggs are sterile. For a microbiological fight, some organisms should be used that can fight the infestation. For example, it could be useful to use types of nematodes, such as Neoaplectana carpocapsae and Neoaplectana feltiae. These nematodes sprayed with tools inside the tunnels can attack insect larvae. There is also the possibility of using some entomopathogenic fungi or employing antagonist insects such as some Diptera and some Hymenoptera.