Palaniswami and Mohandas [49] conducted a study in India to investigate the efficiency of reridging in sweet potato plant in reducing the infestation of weevils.

Sweet potato is the major stable food (across PNG), yet highly vulnerable to drought and frost. Group 1 bacteria produce spores near the soil surface. Sex pheromone trap is widely used to capture adult sweet potato weevil in plantation owing to its high efficiency [92].

Intercropping Little research information is available on this approach for the management of sweet potato weevil. Jun 18, 2019. At an altitude, a research conducted in Kerala shows that damages on tubers by weevil infestation was observed to be lower of up to 22% at lowland level whiles at upland level, weevil infestation damage on tuber increase at a rate of 4%-50% [49]. Sanitation practices play a vital role in protecting sweet potato from pests with limited flying capacity such as sweet potato weevil. At lower elevations of less than 2000 m above sea level, damage to the crop tends to be more [26,29]. In the Dominican Republic, sweet potato farm-level losses due to weevil infestation were estimated at 39% [22]. [110] conducted a study to transform Cry3A gene into sweet potato roots to fend against sweet potato weevil, Cylas formicarius. Although different subspecies of sweet potato weevils can be found in different geographical locations, their modes of action remain the same [24]. Management of soil helps to avoid cracks in the soil, which aimed to minimize crop destruction as much as populations are existence. Table 2: Sweet potato cultural practices. The traps, baited with 0.1 mg of decyl (E)-2-butenoate and dodecyl (E)-2-butenoate, were placed in 0.5-hectare fields. Orange-fleshed varieties are exposed to superior resistance [87]. Destroy crop residues left in the field after harvest, as weevils survive in discarded storage roots and also in the stems of harvested vines. The tuber becomes spongy in appearance, riddled with cavities, and dark in colour [26]. The pheromone has been absorbed onto rubber tubing which is held in place by wire.

[95] conducted a field study in Guam to determine the efficacy of controlling Cylas formicarius using bucket traps with (Z)-3-dodecen-1-ol (E)-2-butenoate. Introduction. Some farmers practise mixed cropping systems with sweet potato, rice, cowpea, maize, ginger, and yam to reduce the incidence of sweet potato weevils.

In a separate study, Hwang and Hung [91] conducted a field experiment to test the efficacy of five insecticides: chlorpyrifos, phorate, terbufos, fensulfothion, and carbofuran, in controlling sweet potato weevils, by applying the insecticide twice to soil before planting and during earthing up.

Sweet potato weevil control was acceptable in a field planted away from a weevil-infested field, whereas the tubers were heavily infested when the fields were adjacent to each other. continued below. Most of them are active during the night, which makes it more difficult to detect their presence. Also, the IPM program implemented in Taiwan has helped the local farmers; these applied methods include crop rotation, alternate host removal, continuous pheromones trap and mulching [102].