Larval diet affects development and reproduction of East Asian strain of the fall armyworm, Spodoptera frugiperda

doi:10.1016/S2095-3119(19)62879-0

摘要/Abstract

摘要：

草地贪夜蛾于2018年12月入侵中国后，对玉米和高粱等农作物生产造成了影响。鉴于草地贪夜蛾的幼虫食性存在明显的品系分化，我们在室内评价了幼期食物（玉米、高粱、小麦、水稻和人工饲料）对入侵种群生长发育和成虫繁殖的影响。研究结果表明，幼虫期的食物对发育历期、化蛹率、蛹的存活率和羽化率以及成虫的繁殖均有显著的影响。取食高粱的幼虫发育期长达19.4天，而取食人工饲料的仅为14.1天。取食人工饲料的幼虫存活率高达99.6%，而取食水稻的仅有0.4%。取食人工饲料以及不同生育期作物叶片的化蛹率和蛹的存活率亦有很大的差异。取食人工饲料的蛹重0.26 g，而取食高粱的仅为0.14 g。取食2叶期玉米的成虫单雌产卵量最高，为699.7粒。取食4-5叶期玉米的卵孵化率为93.6%，显著高于取食人工饲料的36.6%。取食不同食物的草地贪夜蛾种群内禀增长率和周限增长率存在较大的差异，以幼嫩的玉米叶片最为适宜。研究结果对发展草地贪夜蛾入侵种群的室内饲养技术、田间预测预报模型和综合治理技术有重要价值。

Abstract:

In December 11, 2018, the fall armyworm (FAW), Spodoptera frugiperda invaded China and has since impacted local maize, sorghum and other crops. Here, we draw on laboratory experiments to show how different host crops (i.e., maize, sorghum, wheat and rice) and artificial diet affect larval growth and adult reproduction of one local FAW strain. Larval diet affected development duration, pupation rate, survival and emergence rate of pupae, and S. frugiperda adult fecundity. FAW attained the slowest larval development (19.4 days) on sorghum and the fastest (14.1 days) on artificial diet, with larvae attaining 99.6% survival on the latter food item. On rice, FAW larvae attained survival rate of 0.4% and were unable to pupate successfully. Pupation rate and pupal survival varied substantially between artificial diet and live plantlets at different phenological stages. Pupal weight was the highest (0.26 g) on artificial diet and the lowest (0.14 g) on sorghum, while FAW females reached the highest fecundity (699.7 eggs/female) on 2-leaf stage maize. Egg hatching rate equaled 93.6% on 4- or 5-leaf stage maize and 36.6% on artificial diet. FAW intrinsic rate of natural increase and the finite rate of increase varied between larval diets, reflecting how young maize leaves are the most suitable diet. Our findings can help to refine laboratory rearing protocols, devise population forecasting models or guide the deployment of ‘area-wide’ integrated pest management (IPM) modules in FAW-invaded areas of China and other Asian countries.

Key words: developmental duration , development , fecundity , life history , insect mass-rearing , biology , invasion biology

. [J]. Journal of Integrative Agriculture, 2021, 20(3): 736-744.

HE Li-mei, WANG Teng-li, CHEN Yu-chao, GE Shi-shuai, Kris A. G. WYCKHUYS, WU Kong-ming. Larval diet affects development and reproduction of East Asian strain of the fall armyworm, Spodoptera frugiperda[J]. Journal of Integrative Agriculture, 2021, 20(3): 736-744.

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