Micaela Liebenberg
In the past month, a surge of cockroaches has been reported in South Africa, specifically in Tuks Residences. PDBY interviewed Dr Clarke Scholtz, a retired professor and the former head of zoology at the University of Pretoria, to shed some light on this recent infestation.
What type of cockroaches are they?
“There are about two or three types of cockroaches causing problems in South Africa,” states Dr Scholtz. “The one in Pretoria is called the German cockroach, and [its scientific name is] Blattella germanica.” According to Dr Scholtz, this cockroach is considered a synanthropic cockroach – meaning it lives with people – and is found in houses, for example in the kitchen. This species originates from Eurasia and is about 1 cm long. Scholtz indicates that other types of cockroaches are likely contributing to the problem, such as the American cockroach, which can be found outside in dustbins and is about 2 cm long.
Is this a TuksRes problem?
Dr Scholtz states that the cockroaches are, in fact, a nationwide problem. “Apparently, it’s a problem across the country; it’s not just on the Tukkies campus at the moment. […] I’ve had several inquiries from all over the place – Durban and various other places.” Why is this an issue now?
“We don’t know why there is a sudden surge of cockroaches now, but what we do know is that all insects go through population explosions. Those conditions are determined by enough food and suitable environmental conditions,” states Dr Scholtz. He further comments that the moist summers contribute to the problem, since cockroaches live in dark and humid places with high moisture levels.
What can students in Res do?
Dr Scholtz advises against the use of pesticides, especially the ones in spray canisters. He reasons that it contaminates food and other appliances, which could harm our health. He instead recommends the use of bait. This way, cockroaches are lured away from spaces students usually occupy. Storing foods such as sugars, bread, and cold meats in plastic containers and ensuring that dustbins are cleared multiple times a day will significantly alleviate the problem as well.
Dr Scholtz concludes that these cockroaches are not here for the long run. With the weather starting to turn cold, their environmental conditions will no longer be favourable. He also adds that these insects pose no serious health risks. “They are only as dirty as their environment. Theoretically they can carry germs, but such is the case with everyone.” If everyone practises good general hygiene, these cockroaches will not be an issue for long.