[7] Olla v-nigrum are indigenous to Florida but can be found throughout the continental United States and as far south as Argentina.

[8] Olla v-nigrum are found in Hawaii and Guam where they were once introduced due to biological control efforts.

With the Asian lady beetle spreading to South America to countries such as Argentina and Brazil, Olla v-nigrum populations are expected to be negatively impacted.

Olla v-nigrum has been observed in nature to specifically prey upon the Asian citrus psyllid (Diaphorina citri) as well as various aphids such as the Schizaphis graminum, Hyadaphis sp., Metopolophium dirhodum, Uroleucon sp., Breviocryne brassicaee L. and Myzus sp.

[10] Additionally, it has been tested whether Olla v-nigrum prey on the Southern green stink bug (Nezara viridula) eggs and nymphs.

Research has indicated that feeding this species with Anagasta kuehniella Zeller along with an artificial diet impacts Olla v-nigrum adults.

However, in these attempts, Olla v-nigrum fell victim to parasitism of its own from the phorid Phalacrotophhora quadrimaculata that was found to infest the beetle.

[16] The eggs of the Phalacrotophhora quadrimaculata have been observed to be laid on the pupa of Olla v-nigrum and are usually placed in groups of up to 8 on their victims.

Olla v-nigrum are important for the integrated control of pecan aphids because they have been shown to exhibit a lower mortality rate to certain pesticides compared to other beetles that have been used.

In addition, Olla v-nigrum have also been shown to be infected to have an increased mortality rate when they are co-infected by the fungi, Hesperomyces virescens and either Beauveria bassiana or Metarhizium brunneum.

Although spread among much of the same regions as Harmonia acyridids, Olla v-nigrum show a much higher mortality rate when infected by Beauveria bassiana, a different type of fungus.

Similarly to the fungi, Olla v-nigrum were more susceptible to infection from the nematodes than the exotic Asian lady beetle (Harmonia acyridis).

Although beetles aren't the first choice of host for nematodes in the wild, in an experimental setting, they have been demonstrated to have a mortality rate greater than 80% in Olla v-nigrum two days after infection.

[21] Olla v-nigrum has been found to exhibit signs of cannibalism, even when there are sufficient resources available to the beetle.

Finally, the size of the group of Olla v-nigrum larva has also been shown to not affect the number of cannibalism events among the beetles.

In the first instar, Olla v-nigrum larvae were shown to have a 100% mortality rate when fed exotic H. axyridis eggs.

When Olla v-nigrum began eating exotic H. axyridis eggs in the third instar, they still suffer from a 95% mortality rate experimentally.

However, when fed other native species, there has been no evidence to suggest a significant increase in mortality rate in Olla v-nigrum.