Abstract:This work was initiated for the first time to identify parasitoid species associated with the immature stages of Pieris rapae (L.) inhabiting cabbage plantations in Assiut governorate, Upper Egypt during the 2018 and 2019 cabbage growing seasons. Attacking periods and parasitism percentages (PPs) of the identified parasitoid species were calculated. One solitary parasitoid species, Hyposoter ebeninus was found to attack P. rapae larvae in the field 110 days after transplantation. However, one hyperparasitoid s… Show more
“…This is also supported by Tena et al, in which a two-fold increase of parasitized hosts by Aphytis melinus in a citrus agroecosystem, was evident on trees supplied with sugar [35]. Apart from that, other factors such as host instar stage [36] and progenies development strategy such as gregarious parasitoid [37] could also affect the parasitism rate.…”
Coconut black-headed caterpillar (Opisina arenosella) or BHC is one of the main coconut palm defoliators in many Asian countries, including Malaysia, where it was discovered in 2017. Since then, an effort has been made to manage the pest by the use of larval parasitoids, started with a study on the effects of sucrose diet on reproduction, longevity and parasitism of a naturally occurring parasitoid known as Bracon brevicornis (Hymenoptera: Braconidae). The aim of this study was to determine the optimal sucrose concentration for improving its rearing technique. Two experiments were conducted, i.e., a) reproductive performance study; and b) longevity study. In each study, different sucrose concentrations were tested on mated females in five (5) replications. Feeding on 20% sucrose concentration resulted in significantly (P<0.05) highest fecundity (82.4 ± 0.9), hatchability (100%), pupation, fertility (82.7%) and longest reproductive period (12.8 ± 0.3 days) of B. brevicornis among treatments. Meanwhile, 40% sucrose was able to prolong its adults' lifespan (20.6 days). Adults fed on 20% sucrose had the highest parasitism (33.4±0.6 host larvae), despite the fact that 30% sucrose had no statistically significant difference. Thus, this study suggested that 20% sucrose could be suitable to increase fertility and parasitism by B. brevicornis. However, additional research on its effect on behaviours is necessary to acquire a better knowledge of its efficiency in the field.
“…This is also supported by Tena et al, in which a two-fold increase of parasitized hosts by Aphytis melinus in a citrus agroecosystem, was evident on trees supplied with sugar [35]. Apart from that, other factors such as host instar stage [36] and progenies development strategy such as gregarious parasitoid [37] could also affect the parasitism rate.…”
Coconut black-headed caterpillar (Opisina arenosella) or BHC is one of the main coconut palm defoliators in many Asian countries, including Malaysia, where it was discovered in 2017. Since then, an effort has been made to manage the pest by the use of larval parasitoids, started with a study on the effects of sucrose diet on reproduction, longevity and parasitism of a naturally occurring parasitoid known as Bracon brevicornis (Hymenoptera: Braconidae). The aim of this study was to determine the optimal sucrose concentration for improving its rearing technique. Two experiments were conducted, i.e., a) reproductive performance study; and b) longevity study. In each study, different sucrose concentrations were tested on mated females in five (5) replications. Feeding on 20% sucrose concentration resulted in significantly (P<0.05) highest fecundity (82.4 ± 0.9), hatchability (100%), pupation, fertility (82.7%) and longest reproductive period (12.8 ± 0.3 days) of B. brevicornis among treatments. Meanwhile, 40% sucrose was able to prolong its adults' lifespan (20.6 days). Adults fed on 20% sucrose had the highest parasitism (33.4±0.6 host larvae), despite the fact that 30% sucrose had no statistically significant difference. Thus, this study suggested that 20% sucrose could be suitable to increase fertility and parasitism by B. brevicornis. However, additional research on its effect on behaviours is necessary to acquire a better knowledge of its efficiency in the field.
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