The yield, canopy status and cocoa swollen shoot virus disease (CSSVD) symptom severity were assessed in cacao trees in a long-term field experiment originally established to study cacao swollen shoot virus strain 1A (CSSV-1A) epidemics in plots inoculated with the mild strain CSSV-N1. Yield of cacao was 73.7% and 32.1% lower in cacao plants inoculated with CSSV-1A and the non-inoculated respectively, when compared with cacao plants inoculated with CSSV-N1. CSSVD severity and canopy cover of cacao plants were significantly (P < 0.0001) affected by varying the number of inner rows inoculated with CSSV-N1 as well as individual CSSV strains. The treatments in which all the test cacao trees or first five inner rows received mild strain cross protection (T4 and T1) had the best canopy and lowest disease severity. Trees with CSSV-N1 protection had better canopy and lower CSSVD severity in comparison with the non-inoculated and CSSV-1A inoculated trees. DNA fingerprinting analysis indicated that genetic make-up of the planting material does not appear to contribute significantly to variation in disease severity or canopy status. Significant relationships were established between some soil parameters and CSSVD symptom severity (organic carbon, phosphorus, calcium, nitrogen, magnesium) as well as canopy status (phosphorus, potassium, magnesium).

在可可树中进行了长期的田间试验，评估了产量，冠层状况和可可溶苗病毒病（CSSVD）症状的严重程度，该长期实验最初是为了研究可可苗接种地上的可可溶苗病毒1A（CSSV-1A）流行而建立的。株CSSV-N1。与接种CSSV-N1的可可植物相比，接种CSSV-1A的可可植物和未接种的可可植物的可可产量分别降低73.7％和32.1％。可可植物的CSSVD严重程度和冠层覆盖率均显着（P <0.0001）受CSSV-N1以及各个CSSV菌株接种的内部行数变化的影响。在所有测试可可树或前五个内行均接受轻度应变交叉保护（T4和T1）的处理中，树冠最佳，病害严重程度最低。与未接种和接种CSSV-1A的树相比，具有CSSV-N1保护的树具有更好的树冠和更低的CSSVD严重性。DNA指纹分析表明，种植材料的遗传组成似乎对病害严重程度或冠层状况的变化没有显着贡献。在某些土壤参数与CSSVD症状严重程度（有机碳，磷，钙，氮，镁）以及冠层状况（磷，钾，镁）之间建立了显着的关系。