Cold tolerance of the overwintering egg ofApolygus lucorumMeyer-Dür (Hemiptera:Miridae)

Abstract

Apolygus lucorum has become one of the most pestiferous pests of cotton and fruits with widely applications of transgenic Bt cotton in China. Cold tolerance of its overwintering eggs was studied, and the content of biochemical substances was also determined, to evaluate its overwintering adaptability. The results showed that there were significant differences on cold survival ability of the overwintering eggs among months. Lt50 of the overwintering eggs was in order of January > February > December > March > April at the temperature of-10 ℃ or-20 ℃ , and in order of January > December > March >February > April at the temperature of-30 ℃. The mortality of protected eggs in the April (4. 32% , 5. 36% , 5. 42% , 6. 79% and 7. 63%) was significantly lower than non-protected eggs in the April (46. 06% , 51. 84% , 54. 59% , 63. 07% and 74. 41%) when they were treated at the temperature of-20 ℃ for 1, 2, 3, 4 and 5 days. The cold

Effects of photoperiod and temperature on the developmental duration and diapause in Dolycoris baccarum (Heteroptera: Pentatomidae) from Hohhot, Inner Mongolia, China

“…Research on Colaphellus bowingi Baly (Coleoptera: Chrysomelidae) showed that adults enter diapause at a temperature of ≤20 °C and that temperature was the main environmental factor triggering diapause ( Xue et al 2002 ). However, in temperate regions at high latitudes, temperature is usually a diapause cofactor that acts in concert with the photoperiod ( Danks 2007 , Zhuo et al 2011 , Chen et al 2015 , Saunders 2020 ). For certain insects, both temperature and photoperiod are the main factors that induce diapause ( Fatemeh and Saeid 2018 ).…”

Molecular Correlates of Diapause in Aphidoletes aphidimyza

“…Due to the lack of a reference genome for A. aphidimyza, a total of 37,610 unigenes (37.57% of the assembled unigenes) obtained from the transcriptome results were functionally annotated by comparing them with nine major databases. The Unigenes annotated in each database were COG (8435), Swissprot (15,901), KOG (25,554), eggNOG (25,184), Pfam (26,363), GO (28,663), KEGG (29,481), TrEMBL (29,705), and Nr (30,815) (Figure S2). therefore, usable for subsequent analysis.…”

“…Insects that undergo embryonic diapause are mainly sensitive to the photoperiod during the maternal stage. For example, when raised under normal conditions, A. lucorum produced non-diapausing eggs, but the exposure of the first instar larvae to a short photoperiod resulted in the production of diapausing eggs [29]. Insects that undergo larval diapause are mainly sensitive to the photoperiod throughout the entire larval stage or at a certain larval stage.…”