Fitness parameters of Plutella xylostella (L.) (Lepidoptera; Plutellidae) at four constant temperatures by using age-stage, two-sex life tables

Abstract

Different temperature zones have significant impact on the population dynamics of Plutella xylostella. Effective management of P. xylostella requires the knowledge of temperature tolerance by different life stages. In the current study, fitness parameters of diamondback moth were reported by using age-stage, two-sex life table traits at four constant temperatures (15, 20, 25 and 30 °C). The life cycle of P. xylostella was significantly longer at 15 °C. The 20 °C level of temperature was found optimal for fecundity, gross reproductive rate (51.74 offspring) and net reproductive rate (44.35 offspring per individual). The adult pre-oviposition period was statistically at par at all four level of temperatures. However, the survival was maximum at 20 °C as compared to other three temperature ranges. Based on the current study, it was concluded that temperature has a great role in population build-up of P. xylostella and effective management tactics should be applied to prevent significant damage to cabbage and other cruciferous crops when the temperature in the field is near 20 °C.

Using a Two-Sex Life Table Tool to Calculate the Fitness of Orius strigicollis as a Predator of Pectinophora gossypiella

“…Moreover, there was no significant difference between the three treatments (prey densities). This may be attributed to nutritional content or quality of the particular diet/prey, less food pressure to complete development, physical defense or response of the prey, more feeding resources [5,[11][12][13][14][15]30,33,79,[82][83][84], different preference behavior of the generalist predators to egg laying [5,7,16,42,78,[85][86][87][88], and to complete metabolic reactions in the insect body under selection pressure [57,89,90]. We recorded that the females lived longer than the males (Table 2), which are in correlation with previous studies [30,32,33,42,44,54].…”

“…The fitness and population, or life table parameters, were determined with the help of the age-stage, two-sex life table tool that efficiently explains the aspects of the prey range on the fitness and development of the predators [11,14,57,58]. Selection pressure is a barrier for the decision of suitable, favorable, or reliable sources of food for insects to complete their entire development or life stages, and the survival of future generations [11][12][13][14].…”

Effects of temperature on baseline susceptibility and stability of insecticide resistance against Plutella xylostella (Lepidoptera: Plutellidae) in the absence of selection pressure

“…The diamondback moth, Plutella xylostella L. (Lepidoptera: Plutellidae), is an important insect pest of cruciferous crops worldwide (Furlong et al, 2013, Jaleel et al, 2017, Saeed et al, 2019). Worldwide yield losses and the cost of management associated with the diamondback moth is estimated to be about 4–5 billion dollars annually (Zalucki et al, 2012).…”

Determination of fitness traits of Orius strigicollis Poppius (Hemiptera: Anthocoridae) on Pectinophora gossypiella (Lepidoptera: Gelechiidae) using two-sex life table analysis

“…The same trend was observed in the present study with little contrast, where the total longevity of the female and male adults of O. strigicollis decreased and changed according to temperature, except at 28 °C where the total longevity of females was higher (26.12 days) and there was no significant difference between the three treatment temperatures. This result may be attributed to the nutritional content of particular diets/hosts, increased feeding, different temperatures (suitable for females) to egg laying and to complete metabolic reactions in the female body ( Saeed et al, 2019 ; Ali et al, 2020 ). We recorded that the females lived longer than the males, and the total longevity of males at 24, 28 and 32 °C was 26, 23.67 and 21.25 d, respectively, whereas the total longevity of females at 24, 28 and 32 °C was 23.83, 26.12 and 23.33 d, respectively, which agreed with the findings of previous studies ( Zhou et al, 2006 ; Zhang et al, 2012 ).…”