Mass rearing of potato tuber moths was conducted in a biocontrol laboratory to seek out appropriate management for the pest. The larvicidal efficacy of insecticides was studied by using four insecticides Bojho, Emamectine benzoate, Spinosad, Neem. The study discovered the effectiveness of all the insecticides, however the three pesticides had higher efficacy compare to Neem. The overall result indicates the highest mortality rate in treatments Bojho (100%), Emamectine benzoate (100%), and Spinosad (100%) whereas the lowest mortality rate in treatment Neem (94%). The infestation was conjointly high in Neem compare to the other three pesticides. To examine the efficacy of pesticides against PTM the applied treatments Bojho, Emamectine benzoate, and Spinosad was found to be the best insecticide among the trials in bringing down the PTM population as Neem showed to be less effective out of the total four pesticides applied. All the pesticides were effective in reducing insect population under laboratory conditions; however, their effectiveness was directly proportional to concentration and exposure periods. The study has demonstrated the possibility of using novel compounds in the IPM program.
Potato tuber moth is a serious pests of potato which cause qualitative as well as quantitative loss on tubers at stores. Major control mechanism is to use chemical pesticide but this pose great hazard risk to the growers and consumers. Therefore this study evaluated tubers of ten potato genotypes viz. CIP 394600.52, CIP 393371.164, Khumal Ujjawal, PRP 296667.2, CIP 393385.39, CIP 395112.32, PRP 226567.2, PRP 0165667.6, CIP 393371.159, and Khumal Upahar against potato tuber moths for their ovipositional preferences and damage potential with nine replication in the laboratory. Number of deposited eggs for four days at eye and outside the tubers on skin, number of tunnel and tunnel length was measured. Least percentage of egg laid eye was least in genotype CIP 394600.52, CIP 393371.164 and variety Khumal Ujjawal respectively. The least number of total eggs laid on eyes was on genotype CIP 394600.52 9 (2.33±1.00) followed by variety Khumal Ujjwal. Although genotype CIP 393385.39 and Khumal Ujjwal was among the most preferred (6.00±2.45) genotype for oviposition, average number of tunnels and average total tunnel length remained very low. Factors such as physical, nutritional, chemical or genetical which may be involved inducing resistance mechanism thus should also be studied and verified.
This study was conducted with the objective of assessing post harvest losses of potato varieties under farmers' storage conditions. Potato tubers of 7 varieties (4 released varieties viz. 'Janakdev', 'Khumal Upahar' Khumal Ujjwal and 'Khumal Vikash'; 2 registered varieties viz. ' and a local cultivar viz. Panauti Golo) were evaluated in randomized complete block design with four replications under four farmers' storage condition at Panauti-8, Kavrepalanchok district of Nepal during May 24 to Ausgust 11, 2019. Data were recorded on 20, 40, 60 and 80 days of storage. Observations were recorded on average weight loss, damage by tuber moth, days to sprouting, sprout length, days to shrinking, and damage due to rotting. The results showed that at 80 days of storage, the lowest weight loss (8.31%) was found in 'Khumal Ujjwal' followed by 'Janakdev' (8.74%) and 'Panauti Golo' (8.85%). Tthe difference between number of eyes and infested eyes was minimum in 'Panauti Golo' (1.65). Llate sprouting was observed in 'Panauti Golo' (68.5 days) and 'Khumal Upahar' (68.2 days). The shortest sprout length (2.3 cm) was recorded in 'Panauti Golo'. Shrinkage was late in 'Panauti Golo' (79 days) and 'Jankadev' (75.8 days).No damage by potato tuber moth was observed in the flesh of 'Panauti Golo' and 'Khumal Upahar'; however external infestation was detected in their eyes. Therefore, local cultivated variety 'Panauti Golo' was promising for its shelf-life in farm condition; which can be recommended for commercial production in mid-hill environment of Nepal.
Potato is one of the major crops of Nepal and postharvest loss is one of the major problems in the potato value chain system. Therefore, this study was conducted with the objective of assessing post-harvest losses of potato under farmers’ storage conditions. Potato tubers of six potato genotypes (three released varieties viz. ‘Jankdev’, ‘Khumal Upahar’ and ‘Khumal Vikash’ and three pipeline genotypes viz. ‘CIP 393073.179’, ‘CIP 395112.32’ and ‘Techno 304351.109’) were evaluated in randomized complete block design with three replications under four different farmers’ storage conditions at Panauti-8, Kavrepalanchok district of Nepal from May to August 2019. The tubers were cured after harvesting for two weeks in a shade, thereafter they were stored for 80 days. Data were recorded on 20, 40, 60, and 80 days of storage. The results showed that at 80 days of storage, the lowest weight loss (5.51%) was found in Techno 304151.109 followed by CIP 393073.179 (6.68%). Potato tuber moth infestation was minimum in CIP 393073.179 (1.15) followed by Techno 304151.109 (1.25). The days to sprouting was the highest in CIP 393073.179 (69.25) followed by Techno 304151.109 (68.75). No shrinkage was observed in CIP 393073.179 and Techno 304151.109 till 60 days of storage. Loss due to rotting was not observed in these genotypes. Therefore potato genotypes CIP 393073.179 and Techno 304351.109 were promising for their storability in farm conditions; which can be recommended for commercial production in the mid-hill environment of Nepal.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.