胶孢炭疽菌婆婆纳专化型侵染波斯婆婆纳的影响因子的研究

Factors influencing phthogenicity of Colletotrichum gloeosporioides f.sp. veronicae to Veronica persica.

通过盆栽试验 ,研究了真菌自身生物学特性、杂草生长状况和环境因素等对胶孢炭疽菌婆婆纳专化型菌株QZ 97a侵染波斯婆婆纳的影响 .结果表明 ,子叶期和衰老期的波斯婆婆纳感病性最强 ;培养 7～1 4d后的孢子侵染力最强 ;病害发生的最佳温度范围是 1 5～ 2 5℃ ;在保湿 2～ 3d的条件下 ,露期中间的光照时间越短 ,病害发生越严重 ;保湿也可通过添加玉米粉和黄豆粉等介质来解决 ;达到理想致病效果的该菌株孢子悬浮液浓度必须在 1 0 7个·ml-1 以上 .由此可见 ,菌株QZ

The effects of the characters of the fungus, the growing period of plants and environmental factors on the pathogenicity of Colletotrichum gloeosporioides f.sp. veronicae infecting Veronica persica were studied in pot experiments. The results showed that 1.08×10 8spores·ml -1 suspension could kill the seedlings with two cotyledons within one week and cause old plants serious disease. 1×10 8 spores·ml -1 was optimal concentration and 1 or 2 weeks old was the best age of the spores for killing birdseye speedwell. The optimal temperature was 15～25℃ for the disease development. More than two days' dew exposure was required to kill the weed. However, the disease was also developed better when corn or soybean flour was added or the darkness period during dew exposure was prolonged.