中文摘要：

为了明确椰子织蛾幼虫的龄数、取食量及龄期。在室温25℃±3℃,寄主食料椰子叶饲养条件下,测量了雌、雄幼虫头壳宽、取食量并记录了各龄幼虫的发育历期。结果表明,椰子织蛾雌性幼虫有9-10个龄数,雄性幼虫有8-10个龄数。1-10龄雌虫的头壳宽约为0.2300,0.3250,0.4300,0.5267,0.7700,0.9633,1.3775,1.5850,1.8200,2.1929 mm。1-10龄雄虫的头壳宽约为0.2233,0.3214,0.4125,0.5300,0.6529,0.8675,1.1267,1.3375,1.4950,1.8925 mm。9-10龄雌虫的头壳宽显著大于雄虫的头壳宽。头壳宽与龄数具有很强的相关性。椰子织蛾幼虫的取食量随龄数的增大而增加。椰子织蛾1代雌性幼虫平均取食椰子叶的面积（3607.23±146.83 mm~2）显著高于1代雄性幼虫平均取食椰子叶的面积（1991.25±143.92 mm~2）。1-5龄幼虫的取食量最小,小于50 mm~2。8-10龄为暴食期。1-10龄幼虫的发育历期分别为4.55±0.16,5.69±0.24,5.73±0.37,5.22±0.15,5.11±0.46,4.61±0.46,5.12±0.68,6.00±0.43,6.86±0.40和8.75±1.55 d。对于雌、雄成虫个体差异较大的昆虫,对其幼虫头壳宽值和取食量的测定应雌、雄幼虫分别测定。椰子织蛾的防治适期应在未造成严重为害的1-5龄幼虫高蜂期进行。以幼虫头壳宽为主,同时结合取食面积判定幼虫所处龄数,可为准确掌握防治时期提供科学依据。

英文摘要：

In order to define the instar numbers,feeding amount and duration of the instar of Opisina arenosella Walker larva,the head capsule widths and feeding amounts of different instars of O. arenosella female and male larvea fed on coconut leaves were tested,and durations of the instar were recorded under 25℃ ± 3℃ in the laboratory. The results showed that female larvae had 9-10 instars and male larvae had 8-10 instars. The head capsule widths of 1~（st）-10~（th）instar female larvae were about 0. 2300,0. 3250,0. 4300,0. 5267,0. 7700,0. 9633,1. 3775,1. 5850,1. 8200,2. 1929 mm,respectively,and the head capsule widths of 1~（st）-10~（th）instar male larvae were about 0. 2233,0. 3214,0. 4125,0. 5300,0. 6529,0. 8675,1. 1267,1. 3375,1. 4950,1. 8925 mm,respectively. The head capsule widths of 9~（th）-10~（th）instar female larvae were significantly wider than those of 9~（th）-10~（th）instar male larvae. The head capsule widthswere significantly correlated with the instar. Larval feeding amounts increased with an increase in the instar.The feeding amount of O. arenosella female during larval stage（ 3607. 23 ± 146. 83 mm~2） was significantly more than that of male（ 1991. 25 ± 143. 92 mm~2）. The feeding amounts of 1~（st）-,2~（nd）-,3~（rd）-,4~（th）-,and 5~（th）-instar larvae were the lowest（ 50 mm~2）. The greedily eating period of the larva were 8th-10~（th） instars. The average duration of 1~（st）-10~（th）instars were 4. 55 ± 0. 16,5. 69 ± 0. 24,5. 73 ± 0. 37,5. 22 ±0. 15,5. 11 ± 0. 46,4. 61 ± 0. 46,5. 12 ± 0. 68,6. 00 ± 0. 43,6. 86 ± 0. 40 and 8. 75 ± 1. 55 d,respectively. If the individual differences for female and male insects are big,the head capsule widths and feeding amounts of female and male larvae should be tested separately. The optimum control stage of O.arenosella larvae is the period when larvae are mainly in 1~（st）-5~（th）instars. Discrimination of the instar mainly according to the head capsule widths,and meanwhile,feeding amounts