On the Fungus Associated with the American Cockroach insect Periplaneta Americana and the use of its bacterial suspensions in its biological resistance

Abstract

The study has been conducted in the Al- Basra/Iraq, where 1500 alive and dead American cockroach and its nymphs were collected from their habitat. During the collection of those insects that showed abnormal appearances such as slow movement, short and tortuous antennae, and irregular and equal wings, fourteen fungal families of insects were isolated, dating back, for example, to the species: Aspergillus flavus, A.terreus, A.restrictus.  A.flavus was the highest fungus appearing in the samples, while M.variotii was the least fungus with rates of 21% and 2.6%, respectively. The insects were reared and propagated in breeding boxes to obtain healthy insects for use in the experiment of bacterial suspensions. Aqueous bacterial suspensions of these fungi were prepared and sprayed with the nymphs of the longest instar and adult nymphs of the sixth instar. A restrictus fungus suspension had the highest effect, with a killing rate of 96.6% in the first treatment and 63.3% in the second treatment. While the fungus Rhizopus sp isolate was the least effective fungus in killing by 3.3% less, without a significant difference from the control treatment.