The influence of cultivation measures,such as adjustment of bamboo strand structure,sun bathing of the bamboo shots and top-pruning on shoot,on culm morphology were studied.The results were summarized as follows: The ...The influence of cultivation measures,such as adjustment of bamboo strand structure,sun bathing of the bamboo shots and top-pruning on shoot,on culm morphology were studied.The results were summarized as follows: The individual numbers per clump was negative correlated with malformation rate of culm,the optimal individual numbers per clump was 4-5.From high malformation rate of new bamboo with different shooting period to low malformation rate,there appeared in turn earlier shooting,middle shooting and latter shooting.Some measures such as removal of weak and small shoot and normal culm shoot increased malformation numbers,malformation rate and ground diameter of new bamboo by 39.2%,118.3% and 151.9% respectively.Sun bathing of the bamboo shots increased the number of shoot,bamboo emerging,malformation and malformation rate by 17.6%,35.4%,79.8%,33.0% respectively.Top-pruning on time was negative correlated with the number of shoot,bamboo emerging and malformation rate,and the optimal height of top-pruning is 10-15 cm.展开更多
The wilt disease of Bambusa ventricosa was a serious disease occured in Nanping city, Fujian Province. The symptoms of the disease, identification, inoculation, biological characteristics of the causal organism and bi...The wilt disease of Bambusa ventricosa was a serious disease occured in Nanping city, Fujian Province. The symptoms of the disease, identification, inoculation, biological characteristics of the causal organism and bionomics of the wilt disease were studied. The species was identified as Nectria ditissima Tul. at sexual phase, and as Fusarium semitectum Berk. & Rav. at anamorphic state. The causal organism of wilt disease grew vigorously on the PSA and PSA+10% decoction of culm media, and formed white coloured colonies. After incubation of 7 days at 28℃, a great amount of macroconidia was produced, no stroma and perithecia were formed after 30 days. The stroma and ascospore were only produced under natural condition. The preference temperature for mycelia growth was between 25～28℃, and the optimum pH values was at 6～7. The optimum temperature for conidia and ascospores germination was between 25～28℃, and the optimum pH values was at 6～7. The high relative humidity (RH 96.1%～100%) was necessary for the germination of conidia and ascospores. The results of experiments showed that the pathogen of the wilt disease overwintered on the soil, and disseminated by winds and rains to infect the wounded stem base of Bambusa ventricosa. The primary infection occurred from the last ten days of February or the first days of March. The peak infection occurred from the first ten days of March to the second ten days of April during early summer rains. The infection ceased from the second ten days or the last ten days of May. The freeze injury was possibly important factor to induce infection of the wilt disease.展开更多
文摘The influence of cultivation measures,such as adjustment of bamboo strand structure,sun bathing of the bamboo shots and top-pruning on shoot,on culm morphology were studied.The results were summarized as follows: The individual numbers per clump was negative correlated with malformation rate of culm,the optimal individual numbers per clump was 4-5.From high malformation rate of new bamboo with different shooting period to low malformation rate,there appeared in turn earlier shooting,middle shooting and latter shooting.Some measures such as removal of weak and small shoot and normal culm shoot increased malformation numbers,malformation rate and ground diameter of new bamboo by 39.2%,118.3% and 151.9% respectively.Sun bathing of the bamboo shots increased the number of shoot,bamboo emerging,malformation and malformation rate by 17.6%,35.4%,79.8%,33.0% respectively.Top-pruning on time was negative correlated with the number of shoot,bamboo emerging and malformation rate,and the optimal height of top-pruning is 10-15 cm.
文摘The wilt disease of Bambusa ventricosa was a serious disease occured in Nanping city, Fujian Province. The symptoms of the disease, identification, inoculation, biological characteristics of the causal organism and bionomics of the wilt disease were studied. The species was identified as Nectria ditissima Tul. at sexual phase, and as Fusarium semitectum Berk. & Rav. at anamorphic state. The causal organism of wilt disease grew vigorously on the PSA and PSA+10% decoction of culm media, and formed white coloured colonies. After incubation of 7 days at 28℃, a great amount of macroconidia was produced, no stroma and perithecia were formed after 30 days. The stroma and ascospore were only produced under natural condition. The preference temperature for mycelia growth was between 25～28℃, and the optimum pH values was at 6～7. The optimum temperature for conidia and ascospores germination was between 25～28℃, and the optimum pH values was at 6～7. The high relative humidity (RH 96.1%～100%) was necessary for the germination of conidia and ascospores. The results of experiments showed that the pathogen of the wilt disease overwintered on the soil, and disseminated by winds and rains to infect the wounded stem base of Bambusa ventricosa. The primary infection occurred from the last ten days of February or the first days of March. The peak infection occurred from the first ten days of March to the second ten days of April during early summer rains. The infection ceased from the second ten days or the last ten days of May. The freeze injury was possibly important factor to induce infection of the wilt disease.
