Development ofTrichogramma brasiliensis [Hym: Trichogrammatidae] on eggs of radiation sterilized females of potato tuberworm,Phthorimaea operculella [Lep.: Gelechiidae]

Entomophaga ◽  
1987 ◽  
Vol 32 (2) ◽  
pp. 159-162 ◽  
Author(s):  
M. R. Harwalkar ◽  
H. D. Rananavare ◽  
G. W. Rahaikar
Keyword(s):  
Phthorimaea Operculella ◽  
Potato Tuberworm

scholarly journals Comparative Life Tables of the Potato Tuberworm,Phthorimaea operculella, on Leaves and Tubers of Different Potato Cultivars

2014 ◽  
Vol 14 (42) ◽  
pp. 1-11 ◽  
Author(s):  
Ali Golizadeh ◽  
Nader Esmaeili ◽  
Jabraeil Razmjou ◽  
Hooshang Rafiee-Dastjerdi
Keyword(s):  
Life Tables ◽  
Potato Cultivars ◽  
Phthorimaea Operculella ◽  
Potato Tuberworm

scholarly journals Winter is coming: cold hardiness attributes of a field population of the potato tuberworm Phthorimaea operculella

2015 ◽  
Author(s):  
Stefanos S Andreadis ◽  
Yianna Poulia ◽  
Sofia Noukari ◽  
Barbara Aslanidou ◽  
Matilda Savopoulou-Soultani
Keyword(s):  
Cold Hardiness ◽  
Developmental Stages ◽  
Phthorimaea Operculella ◽  
Field Population ◽  
Freezing Injury ◽  
Winter Mortality ◽  
Supercooling Point ◽  
Short Term ◽  
Significant Difference ◽  
Potato Tuberworm

The potato tuberworm, Phthorimaea operculella (Zeller) (Lepidoptera: Gelechiidae), is a worldwide pest of solanaceous crops especially devastating to potatoes. In the present study we investigated the cold hardiness profile of short-term acclimated and non-acclimated immature and adult stages of a field population of P. operculella. Late instars displayed the lowest mean supercooling point, for both short-term acclimated and non-acclimated individuals, however, no significant differences were observed among developmental stages. Unlike supercooling capacity, acclimation at 5 oC for 5 days enhanced the ability to survive at subzero temperatures after a 2 h exposure. Mean lethal temperature (LTemp50) of all developmental stages (egg, late instar, pupa and adult) decreased after short-term acclimation, however only adults displayed a significant difference among acclimated and non-acclimated individuals concerning their LTemp50 (-11.1 and -8.3 oC, respectively). Generally, pupae were the most cold tolerant developmental stage followed in decreasing order by the eggs and adults, while interestingly late instars were the least ones. Non-freezing injury above the supercooling point was well documented for all developmental stages indicating a pre-freeze mortality and suggesting that P. operculella is considered to be chill tolerant rather than freeze intolerant. Nevertheless, given its high degree of cold hardiness, winter mortality of P. operculella due to low temperatures is not likely to occur and potential pest outbreak can take place following a mild winter.

Susceptibility of Phthorimaea operculella (Zeller) to Insecticides

1996 ◽  
Vol 31 (4) ◽  
pp. 420-426 ◽  
Author(s):  
Celina Llanderal-Cázares ◽  
Angel Lagunes-Tejeda ◽  
José Luis Carrillo-Sánchez ◽  
Carlos Sosa-Moss ◽  
Jorge Vera-Graziano ◽  
...  
Keyword(s):  
Topical Application ◽  
Methyl Parathion ◽  
Wild Population ◽  
Phthorimaea Operculella ◽  
Technical Grade ◽  
Susceptible Population ◽  
Laboratory Colony ◽  
Potato Tuberworm ◽  
Lethal Doses ◽  
Third Instar Larvae

Seven technical grade insecticides were evaluated against a susceptible population and against two field populations of the potato tuberworm Phthorimaea operculella (Zeller) by topical application to third-instar larvae. Using a standard susceptible laboratory colony, we calculated median lethal doses (LD50) of 0.39, 0.059, 0.12, 0.00022, 0.18, 0.010 and 0.0007 μg/larvae for the insecticides DDT, methyl parathion, ethyl parathion, azinphosmethyl, malathion, carbaryl and permethrin, respectively. By comparison, we found that a wild population from Oyameles, Puebla was susceptible to the insecticides while a population from Leon, Guanajuato was susceptible to DDT, methyl parathion, ethyl parathion, malathion and permethrin, but was resistant to azinphosmethyl and carbaryl.

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