桑叶品质对家蚕产卵数影响的研究

Effect of the Leaf Quality of Mulberry on Eggs lying of Silkworm

试验研究了不同桑品种、剪伐形式等因素对家蚕产卵数量的影响。结果表明 :桑品种对蚕的产卵数有较大的增产潜力 ,对造卵叶质最优的桑品种为四倍体品种“桂 9373”和“桂 93554”,其养蚕的产卵数比沙 2×伦 10 9增产 14 .9%和 13.9% ;5龄第 4天前的叶质对产卵数的影响较大 ;冬留长枝的冬伐形式所生长的春叶能显著增加产卵数 ;桑园不同夏伐方式对秋叶叶质也有较大影响。提高桑叶含糖量有利于蚕的发育和增加产卵量。认为 ,蚕种场的桑园 ,应种植含糖量较高的桑品种 ,桑园要保持通风透光 ,冬伐采用冬留长枝的方式 。

The effects of mulberry variety and pruning method on eggs laying of silkworm (Bombyx mori L.) were studied. Mulberry varieties had a great potential of increasing the number of laid eggs. Reared leaves of 'Gui 9373' and 'Gui 93554', tetraploid varieties , silkworm had 14.9% and 13.9% higher laying than the control variety 'Sha 2 × Len 109' respectively. The quality of leaves has a great effect on eggs laying when leaves were used to the larva before fourth day of fifth instar. The spring leaves of mulberry which were produced by the high position pruning in winter obviously increased laying .Summer pruning of mulberry also impacted on the quality of autumn leaves.The increment of saccharinity of leaves is useful for silkworm development and increasing eggs laying .The mulberry varieties of higher saccharinity should be recommended to silkworm farm. It also needs to keep eyes on aeration and sunlight transmitting in the mulberry field and the high position pruning in winter .The bottom pruing in summer is not propositioned .