Black and White: Modified Black-Bottom Containers for Mass Egg Collection of Wolbachia-Infected Aedes aegypti
Environmental Health Institute, National Environment Agency, 5008 Ang Mo Kio Ave 5, #06-13 Techplace II, Singapore 569874, Singapore
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Author to whom correspondence should be addressed.
Insects 2026, 17(4), 387; https://doi.org/10.3390/insects17040387
Submission received: 4 March 2026
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Revised: 29 March 2026
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Accepted: 30 March 2026
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Published: 2 April 2026
(This article belongs to the Collection Science of Insect Rearing Systems)
Simple Summary
Mosquito control programs that release modified mosquitoes to fight diseases like dengue fever need to produce millions of mosquito eggs. However, getting female mosquitoes to lay enough eggs in their large cages is challenging. Too many eggs concentrated on one spot could lead to high larvae fatality during hatching. This study tested different egg collection containers to address these challenges by comparing the egg numbers and hatch rates in various container designs, colors, and paper types. We found that containers with black-bottoms and white textured paper collected the most eggs, likely because mosquitoes are attracted to dark colors and prefer laying eggs on materials that hold moisture well. We also observed that adding more egg-laying papers within larger containers can provide additional surface area and prevent egg overcrowding, therefore reducing larval deaths while improving overall egg yield and collection efficiency. These improvements in egg collection methods will help facilities produce healthy mosquitoes more efficiently, making mosquito control programs more cost-effective.
Abstract
Efficient egg collection is important for large-scale mosquito rearing, but it presents logistical challenges and often yields suboptimal egg numbers in mass rearing cages. Furthermore, uneven distribution of eggs on oviposition substrates can lead to higher fatality of the first instar (L1) larvae among overlapping/stacked eggs. Previous studies showed that incorporating darker hues into oviposition pots (ovipots) improves egg collection, yet few discussed designs of containers for use in mass rearing cages. Using a no-choice experimental setup, the number of eggs collected per female was determined in cages of Wolbachia-infected Aedes aegypti mosquitoes provided with different ovipots. The percentage of dead larvae among the stacked eggs was also determined. Based on this information, different prototypes of a more efficient, larger ovipot were evaluated in mass rearing cages. A black-bottom container with white crepe paper collected the most eggs per blood-fed female by promoting higher oviposition rates. A significantly lower percentage (0.31%) of dead L1 larvae were found among relatively sparser eggs compared to 0.96% among stacked eggs. A larger, black-bottom ovipot with oviposition papers positioned at the center of the container, demonstrated suitability for use in mass rearing cages, promoting better egg distribution and yield.
Keywords:
Aedes; mass rearing; egg yield; colonization; mosquito release program
