Neotropical Entomology (2004) 33, 1-6

Rosina Taveras, Luko Hilje and Manuel Carballo (2004)
Development of Hypsipyla grandella (Zeller) (Lepidoptera: Pyralidae) in response to constant temperatures
Neotropical Entomology 33 (1), 1-6
Abstract: Developmental response of the mahogany shootborer, Hypsipyla grandella (Zeller), to temperature was determined in laboratory trials in Turrialba, Costa Rica. Two hundred fresh eggs (less than 24h old) were placed individually inside glass flasks, and exposed to seven constant temperatures (10, 12.5, 15, 20, 25, 30 and 35°C), in separate experiments. These were carried out in environmental chambers, at 80-90% relative humidity and 8L: 16D photoperiod, After hatching, larvae were fed tender foliage of Spanish cedar (Cedrela odorata) and were inspected every 24h to determine larval and pupal duration, and adult emergence, at each temperature. Relationships between these variables and temperature were analyzed by means of ANOVA, regression and correlation procedures. Temperature greatly influenced development of H. grandella immature stages and adult emergence; development time varied between 30 days (30°C) and 104 days (15°C). Larval mortality was high at those temperatures, reaching values of 90% (15°C) and 45% (30°C). Also, mortality of the first larval instar was relatively high (51-75%) at all temperatures in the range 15-30°C, except at 25°C (14%). Pupal weight was lower at extreme temperatures (15°C and 30°C). Estimation of a common lower thermal threshold for all immature stages (8.5°C) allowed calculation of a general thermal constant (1320 degree-days), which could be used to predict population peaks in the field.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Full text of article
Database assignments for author(s): Luko Hilje

Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution

---

Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Hypsipyla grandella		Costa Rica