将3种生防菌剂与腐植酸生物有机肥结合,制成4种腐植酸生防生物有机肥,应用于接种了镰孢菌的土壤,研究其对辣椒根腐病防治效果的影响。试验结果表明,4种腐植酸生防生物有机肥处理病情指数下降,防病效果提高。同时,土壤微生物群落也发生...将3种生防菌剂与腐植酸生物有机肥结合,制成4种腐植酸生防生物有机肥,应用于接种了镰孢菌的土壤,研究其对辣椒根腐病防治效果的影响。试验结果表明,4种腐植酸生防生物有机肥处理病情指数下降,防病效果提高。同时,土壤微生物群落也发生了变化,根际土壤和非根际土壤的细菌数量比CK分别增加了3.31~5.77倍和6.06~7.49倍,放线菌分别增加了2.98~5.89倍和6.71~11.62倍,而真菌数量分别减少了9.24%~41.58%和1.79%~56.38%,根尖镰孢菌的数量分别减少了2.18~6.92倍和2.51~7.46倍;土壤微生物量碳、土壤微生物量氮、土壤微生物量磷分别增加了250.35~409.42 m g/k g、50.63~61.89 m g/k g和14.30~20.01 m g/k g。可见,施用腐植酸生防生物有机肥能有效降低辣椒根腐病的发生和危害,提高防治效果,适合在辣椒生产中推广应用。展开更多
Greenhouse studies were performed to determine the reactions of 10 “California Wonder” (Capsicum annuum) accessions to the three forms of Phytophthora blight (root rot, stem blight and foliar blight) caused by Phyto...Greenhouse studies were performed to determine the reactions of 10 “California Wonder” (Capsicum annuum) accessions to the three forms of Phytophthora blight (root rot, stem blight and foliar blight) caused by Phytophthora capsici. Differences in root rot, stem blight and foliar blight severities among accessions were significant. The accessions consistently differentiated into two groups across the three disease syndromes. Simple sequence repeat (SSR) markers showed variability both within and between accessions of California Wonder. The variability in the responses to the three forms of Phytophthora blight does not warrant its usefulness as a standard susceptible control in studies involving the Capsicum-P. capsici patho-system.展开更多
A mixture of six Georgia isolates of Phytophthora capsici (Leon.), the causal agent of phytophthora blight, were used for greenhouse mass screening of over 700 accessions of Capsicum annuum for both stem blight and fo...A mixture of six Georgia isolates of Phytophthora capsici (Leon.), the causal agent of phytophthora blight, were used for greenhouse mass screening of over 700 accessions of Capsicum annuum for both stem blight and foliar blight. From this screening, it was determined that resistance to both forms of the disease were relatively common in the germplasm, but resistance to one form of the disease was not strongly correlated to resistance to the other form. Ten accessions previously shown to possess root rot resistance were tested for resistance to stem rot and leaf blight, and were found to also be highly resistant to these forms of the disease. It appears that single accessions have resistance to foliar, stem and root rot caused by P. capsici, which may simplify breeding for resistance to all three forms of the disease.展开更多
文摘将3种生防菌剂与腐植酸生物有机肥结合,制成4种腐植酸生防生物有机肥,应用于接种了镰孢菌的土壤,研究其对辣椒根腐病防治效果的影响。试验结果表明,4种腐植酸生防生物有机肥处理病情指数下降,防病效果提高。同时,土壤微生物群落也发生了变化,根际土壤和非根际土壤的细菌数量比CK分别增加了3.31~5.77倍和6.06~7.49倍,放线菌分别增加了2.98~5.89倍和6.71~11.62倍,而真菌数量分别减少了9.24%~41.58%和1.79%~56.38%,根尖镰孢菌的数量分别减少了2.18~6.92倍和2.51~7.46倍;土壤微生物量碳、土壤微生物量氮、土壤微生物量磷分别增加了250.35~409.42 m g/k g、50.63~61.89 m g/k g和14.30~20.01 m g/k g。可见,施用腐植酸生防生物有机肥能有效降低辣椒根腐病的发生和危害,提高防治效果,适合在辣椒生产中推广应用。
文摘Greenhouse studies were performed to determine the reactions of 10 “California Wonder” (Capsicum annuum) accessions to the three forms of Phytophthora blight (root rot, stem blight and foliar blight) caused by Phytophthora capsici. Differences in root rot, stem blight and foliar blight severities among accessions were significant. The accessions consistently differentiated into two groups across the three disease syndromes. Simple sequence repeat (SSR) markers showed variability both within and between accessions of California Wonder. The variability in the responses to the three forms of Phytophthora blight does not warrant its usefulness as a standard susceptible control in studies involving the Capsicum-P. capsici patho-system.
文摘A mixture of six Georgia isolates of Phytophthora capsici (Leon.), the causal agent of phytophthora blight, were used for greenhouse mass screening of over 700 accessions of Capsicum annuum for both stem blight and foliar blight. From this screening, it was determined that resistance to both forms of the disease were relatively common in the germplasm, but resistance to one form of the disease was not strongly correlated to resistance to the other form. Ten accessions previously shown to possess root rot resistance were tested for resistance to stem rot and leaf blight, and were found to also be highly resistant to these forms of the disease. It appears that single accessions have resistance to foliar, stem and root rot caused by P. capsici, which may simplify breeding for resistance to all three forms of the disease.
