Completoria complens

The main external sign is an alteration in the behavior of the host insect, which becomes lethargic and loses its typical reaction to external stimuli. This is often accompanied by an atypical positioning of the individual on the surface of leaves or plant stems.

In the advanced stages of the disease, a characteristic growth consisting of mycelium and fungal spores appears on the insect's body. Depending on the humidity levels, this growth may have a grayish or white tint, gradually covering the entire exoskeleton.

The infected tissues of the insect become brittle, and the body cavity is completely replaced by fungal biomass. Visually, this appears as the mummification of the individual, which firmly adheres to the substrate using hyphal rhizoids.

Microscopic examination of the infected specimen's tissues reveals the distinct spore structures characteristic of Completoria complens, which feature complex geometry. They are distinguished by high packing density within the insect's hemocoel.

A specific symptom is also the lack of visible damage to the plant tissues themselves; however, an indirect sign is a sharp decrease in the activity of insect pests in specific areas of the field or greenhouse.

The causative agent of the disease is the entomophthoralean fungus Completoria complens. This microorganism belongs to the order Entomophthorales and specializes in parasitizing the bodies of insects and arthropods, often associated with ecosystems hosting plant pests.

The pathogen's life cycle is closely tied to a hyphal system that penetrates the host's tissues, completely filling its body cavity. The fungus possesses a unique ability to adapt to specific microclimate conditions created by the host plant to protect against external factors.

Biologically, this fungus is a highly specialized parasite. It is capable of forming resting spores that remain viable under adverse environmental conditions, ensuring species survival during off-seasons or periods of sharp temperature fluctuations.

A morphological feature of Completoria complens is its ability to actively disperse conidia once a certain humidity level is reached. This enables the fungus to effectively infect new populations of insects that come into contact with infected individuals.

Although the fungus primarily affects arthropods, its presence in an agroecosystem is viewed as a factor in the biological regulation of pest populations. Research indicates that the pathogen actively infiltrates the respiratory and digestive organs of phytophagous insects.

The development of this pathogen depends directly on the relative humidity of the air. Optimal conditions for active sporulation and infection are 80-95%, which is frequently observed in dense plantings or greenhouse environments.

The temperature regime plays a decisive role: the fungus behaves most aggressively in the 18 to 24 degrees Celsius range. At temperatures below 10 degrees, the fungal metabolic processes slow down, entering a dormant stage.

The presence of sufficient host insect population density is a necessary condition for the spread of infection. The higher the pest crowding, the faster the horizontal transmission of spores from one individual to another.

The microclimate within the plant canopy creates ideal conditions for moisture retention, which facilitates spore germination on the insect's body surface. In well-ventilated areas, the risk of fungal epizootics is significantly reduced.

The presence of liquid moisture (dew, condensation) facilitates rapid spore activation and penetration through the insect's cuticle, making early morning hours critical for the fungus's reproductive cycle.

The main harmful effect lies in the mortality of insects, which in some cases is beneficial for the agroecosystem if the goal is to suppress populations of crop pests.

However, in biological research and the industrial rearing of insects (entomophages or pollinators), Completoria complens acts as a serious pathogen capable of destroying laboratory or commercial colonies within a short period.

Economic damage may manifest as the loss of populations of beneficial insect pollinators if the fungus spreads during the flowering phase of main crops, thereby reducing potential yields due to poor pollination quality.

The complexity of assessing the damage is due to the dual role of the fungus as a natural enemy of phytophages and as a threat to beneficial entomofauna, necessitating a cautious approach to field chemical applications.

The imbalance in the entomofauna caused by an outbreak of this mycosis can lead to secondary outbreaks of other pests that were previously controlled by natural predators or parasites.

The primary method of prevention is maintaining an optimal ventilation regime in greenhouses, which lowers air humidity to levels unfavorable for the spread of fungal spores.

When it is necessary to suppress fungal development in entomological laboratory conditions, fungicide treatments aimed at disinfecting surfaces and equipment that come into contact with insects are employed.

Adhering to quarantine measures when introducing new batches of entomophages helps avoid the introduction of the pathogen into healthy populations. Regular monitoring of individual health using microscopic control is essential.

Biological control methods include creating conditions unfavorable for sporulation (lowering humidity) as well as the timely removal and disposal of dead individuals, which are active sources of inoculum.

Agronomic practices, such as optimal plant spacing and timely pruning of dense plant parts, promote natural ventilation, which significantly limits the development of Completoria complens mycelium.