Abstract
Helicoverpa armigera causes serious damage to most crops around the world. However, the impacts of snow thickness on the H. armigera overwintering pupae are little known. A field experiment was employed in 2012–2015 at Urumqi, China. At soil depths of 5, 10, and 15 cm, overwintering pupae were embedded with four treatments: no snow cover (NSC), snow cover (SC), increasing snow thickness to 1.5 times the thickness of SC (ISSC-1), and to two times the thickness of SC (ISSC-2). Results suggested that snow cover and increasing snow thickness both significantly increased soil temperatures, which helped to decrease the mortality of overwintering pupae (MOP) of H. armigera. However, the MOP did not always decrease with increases in snow thickness. The MOPs in NSC and ISSC-1 were the highest and the lowest, respectively, though ISSC-2 had much thicker snow thickness than ISSC-1. A maximum snow thickness of 60 cm might lead to the lowest MOP. The longer the snow cover duration (SCD) at a soil depth of 10 cm in March and April was, the higher the MOP was. A thicker snow cover layer led to a higher soil moisture content (SMC) and a lower diurnal soil temperature range (DSTR). The highest and the lowest MOP were at a depth of 15 and 10 cm, respectively. The SMC at the depths of 10 and 15 cm had significant effects on MOP. A lower accumulated temperature (≤0 °C) led to a higher MOP. The DSTR in March of approximately 4.5 °C might cause the lowest MOP. The largest influence factor for the MOPs at depths of 5 and 10 cm and the combined data were the SCDs during the whole experimental period, and for the MOPs at a depth of 15 cm was the soil temperature in November.
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Abbreviations
- NSC:
-
No snow cover
- SC:
-
Snow cover
- ISSC-1:
-
Increasing snow thickness to 1.5 times the thickness of SC
- ISSC-2:
-
Increasing snow thickness to two times the thickness of SC
- MOP:
-
Mortality of overwintering pupae
- SCD:
-
Snow cover duration
- SMC:
-
Soil moisture content
- DSTR:
-
Diurnal soil temperature range
- CMA:
-
China Meteorological Administration
- MAXST:
-
Maximum snow thickness
- MST:
-
Mean snow thickness
- PA:
-
From November 2, 2012, to April 24, 2013
- PB:
-
From November 2, 2013, to April 30, 2014
- PC:
-
From November 2, 2014, to April 24, 2015
- PSC:
-
Period of snow cover
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The work was supported by the National Natural Science Foundation of China (41275119).
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Huang, J. Presence of snow coverage and its thickness affected the mortality of overwintering pupae of Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae). Int J Biometeorol 61, 709–718 (2017). https://doi.org/10.1007/s00484-016-1249-1
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DOI: https://doi.org/10.1007/s00484-016-1249-1