Codling moth (Cydia pomonella [L.])

Codling moth (Cydia pomonella [L.]), navel orangeworm (Amyelois transitella [Walker]), and Indianmeal moth (Plodia interpunctella [Hübner]) are common insect pests in walnuts (Juglans regia [L.]). Currently, exported in-shell walnuts are disinfested using methyl bromide fumigation. Restrictions o­n methyl bromide use have increased interest in developing alternative postharvesttreatments. Radio frequency (RF) heating is such an alternative. Our tests have shown that heating walnuts with radio frequency energy to temperatures lethal to these important insect pests has no negative effects o­n walnutquality,and may even reduce the susceptibility of walnuts to becoming rancid in storage. Radio frequency treatments provided acceptable rates of heating (5–6 °C min-1) for in-shell walnuts to lethal temperatures. Heating walnuts to 55 °C or higher resulted in 100% mortality of fifth instar navel orangeworm, which is the most resistant of the three insect pests. Moisture content of walnuts is an important factor affecting heating rates during radio frequency treatments. The relationship between average moisture content and average heating rate was linear, and the variability in moisture content and heating rates was higher with a higher average moisture content. Radio frequency treatments reduce the moisture content of walnuts. A combined system of radio frequency heating with hot air has the potential to accelerate or even replace batch drying of walnuts in the future.

ผลลัพธ์ (แอฟริกา) 1:

kodlingmot (Cydia pomonella [l].), naeltjie orangeworm (amyelois transitella [Walker]), en indianmeal mot (plodia interpunctella [Hübner]) is algemeen insekte in okkerneute (Juglans regia [l].). Tans word uitgevoer in-dop okkerneute disinfested gebruik metielbromied beroking. beperkings op metielbromied gebruik het verhoogde belangstelling in die ontwikkeling van alternatiewe postharvesttreatments.radio frekwensie (RF) verwarming is so 'n alternatief. ons toetse het getoon dat verwarming okkerneute met radio frekwensie energie aan temperature dodelik vir hierdie belangrike insekte het geen negatiewe uitwerking op walnutquality, en kan selfs die vatbaarheid van okkerneute verminder galsterig in die stoor.radio frekwensie behandeling voorsien aanvaarbare pryse van verwarming (5-6 ° C min-1) vir in-dop okkerneute dodelik temperature. verwarming okkerneute tot 55 ° C of hoër het gelei tot 100% sterftesyfer van die vyfde instar naeltjie orangeworm, wat is die mees bestand van die drie insekplae. voginhoud van okkerneute is 'n belangrike faktor wat verwarming tariewe gedurende radio frekwensie behandeling.die verhouding tussen gemiddelde voginhoud en die gemiddelde verwarming koers is lineêre, en die variasie in vog en verwarming tariewe hoër was met 'n hoër gemiddelde vog inhoud. radio frekwensie behandeling verminder die vog inhoud van die okkerneute.'n gekombineerde stelsel van radio frekwensie verwarming met warm lug het die potensiaal om te versnel of selfs vervang joernaal droog van okkerneute in die toekoms.