The mold mite, Tyrophagus putrescentiae (Schrank), is an alternative prey for the predatory mites used in biological control. In order to maximize the food supply and maintain the population of predators, it is very important to understand the effects of bran moisture content (BMC) and initial population density (IPD) on mass production of T. putrescentiae. In the current study, the population increase of T. putrescentiae under six BMCs and five IPDs were evaluated at optimal temperature and humidity with suitable photoperiod conditions. The results showed that the population growth rates of T. putrescentiae were significantly higher with higher BMC. The population increased by 8, 32, 72, 304 times within five weeks under different BMC which was 8.3%, 10%, 15%, 20%, respectively. Unfortunately, when BMC reached to 25%, there was a great amount of mildew growing other than the mites. In the case of IPD, about 10000 adult mites per 100 g bran resulted in the largest final population of T. putrescentiae. However, either lower or higher IPD led to a smaller final population. It was also concluded that population growth rate decreased while the initial density was increasing, ranging from 1, 055, 601, 397, 266, 109 times under initial density of ∼5,000, 10,000, 15,000, 20,000, 25,000 adult mites per 100 g bran, respectively. Besides, we also described a method in detail for the effective isolation and counting of mites from bran. We found that population growth grew to maximum (over 50,000 mites / bran per gram) under BMC of 20%, IPD of ∼50 adults / bran per gram, temperature of 28±1 °C, 80±5% R.H. and photoperiod of all darkness, which could be the best condition for mass production of T. putrescentiae. Our results provide basic biological information for the mass rearing of the mold mite, which will maintain stable and controllable food source for the predatory mites.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.
Vol. 20 • No. 5