2011
DOI: 10.1590/s1519-566x2011000500002
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Diapause initiation and alterations in the life cycle of Grapholita molesta (Busck) (Lepidoptera: Tortricidae) as induced by photoperiodic conditions

Abstract: Grapholita molesta (Busck) is one of the major pests of Rosaceae, causing significant damage to buds and fruits. In Southern Brazil, its population density is reduced during Rosaceae dormancy months. The present study evaluated the influence of different photoperiods (L:D) (10:14, 11:13, 12:12, 13:11, 14:10 and 16:8) at 25 ± 1ºC and 60 ± 10% RH on diapause induction of G. molesta eggs, larvae, prepupae, and pupae. The effects of the photoperiod on the life cycle of non-diapausing insects and on the second gene… Show more

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Cited by 6 publications
(4 citation statements)
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References 13 publications
(14 reference statements)
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“…The lower viability of the larval–adult period of insect diapause, when compared with insect nondiapause were similar with the results found by Sausen et al. (2011) , who observed a reduction in larval viability when the insects were exposed to a photoperiod of 12 h. This highlights the metabolic expenditure of insects during the diapause period, once it changes metabolic pathways and physiological processes in the first generation postdiapause ( Kostal 2006 ), causing that occur symptoms associated with LTD. Larvae that expressed the symptom had no discoloration of the body (tegument), compared with other diapaused larvae at the same age.…”
Section: Discussionsupporting
confidence: 87%
“…The lower viability of the larval–adult period of insect diapause, when compared with insect nondiapause were similar with the results found by Sausen et al. (2011) , who observed a reduction in larval viability when the insects were exposed to a photoperiod of 12 h. This highlights the metabolic expenditure of insects during the diapause period, once it changes metabolic pathways and physiological processes in the first generation postdiapause ( Kostal 2006 ), causing that occur symptoms associated with LTD. Larvae that expressed the symptom had no discoloration of the body (tegument), compared with other diapaused larvae at the same age.…”
Section: Discussionsupporting
confidence: 87%
“…In contrast, the final captures in the season happen at a similar time of the year in both provinces (early October). Photoperiod is a key factor regulating the start of diapause in G. molesta [2,40,51] and, in the present study, both provinces had a very similar photoperiod (maximum 3 min difference between provinces; [52]).…”
Section: Discussionmentioning
confidence: 88%
“…Differences in the generation time of G. molesta in successive generations were reported by Damos and Savapolou-Soultani [ 29 ], and we report similar findings in the present study. One of the factors that can influence the development of the pest is the photoperiod, especially in the last generations when the photophase is shorter than that of the generations developed during summer [ 51 ]. Bimodal peaks and generation overlaps were also reported for this species [ 29 , 40 ].…”
Section: Discussionmentioning
confidence: 99%
“…To provide scientific evidence that the proposed mechanism underlies the observed population genetic effects in G. molesta in our study region remains an intriguing topic for future research. Grapholita molesta larvae can develop in shoots of host trees throughout the first part of the season and they could be induced to enter diapause at daylengths occurring in the study region end of June/begin of July (Huang et al., ; Sausen et al., ). Extended diapause of late‐instar G. molesta would result in fewer generations per year, as diapause duration would likely cover the bulk of the fruit‐bagged period.…”
Section: Discussionmentioning
confidence: 99%