Ovipositional preference of potato tuber moth and its damage to different genotypes of potato in free choice condition

Abstract

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.

A review on the biology and management of potato tuber moth

“…yield losses have been recorded as 46 -60% under field conditions and 60 -70% in unprotected storage in indonesia (douches et al 1998). in nepal, it is reported that tuber yield loss due to P. operculella infestation of potato crops ranges from 45 ± 3.2% to 78.9 ± 10% (Aryal & simkhada 2020).…”

“…When potato cultivars were transferred from india to kathmandu for adaptation research under the indian Aid mission program in the early 1960s, the ptm must have been introduced. in nepal, ptm has been documented in more than 15 districts, including high altitudes (Aryal & simkhada 2020). P. operculella, like its major host, the potato, is thought to have originated in western south America (rondon 2010).…”

A Study On Efficacy Of Different Pesticides Against Potato Tuber Moth (Phthorimaea Operculella) In Storage Seed Potato

“…Post-harvest losses were considerably high in South-Asian countries; India and Bangladesh incurred 24 and 20% losses while in Nepal it was as high as 25%. Losses in storage are caused by one of the notorious pest potato tuber moths, P. operculella (Zeller) (Lepidoptera: Gelechiidae), which is one of the major hosts of potato along with other various solanaceous crops like tomato, eggplant, and others (Aryal and Simkhada, 2020). The potato tuber moth (PTM), P. operculella, is one of the destructive pests in tropical and subtropical countries, it is considered as one of the damaging and ubiquitous pests of solanaceous crops especially potato Solanum tuberosum L (Sporleder et al, 2004).…”

“…Potato Tuber Moth must have been introduced in Nepal when potato varieties were brought for adaptive research from India to Kathmandu under the Indian Aid Mission program during the early sixties. PTM has been reported in Nepal from more than 15 districts including high altitudes (Aryal and Simkhada, 2020). P. operculella is presumably originated in Western South America together with its main host, the potato (Rondon, 2010).…”

“…), chili pepper (Capsicum frutescens L.), tobacco (Nicotiana tabacum L.), cape gooseberry (Physallis peruviana L.), field ground cherry (Rondon, 2010). PTM damage under field and storage conditions ranged from 20-30% in normal conditions whereas harvesting the potato at peak infestation period together with improper storing conditions end up in 25 to 100 % damage (Aryal and Simkhada, 2020). This study was carried out to devise a suitable control measure against potato tuber moth with the use of novel pesticides and also to study the efficacy of pesticides against Potato Tuber Moth (P. operculella) in storage seed potato.…”