ISHS Acta Horticulturae 811: VI International Congress on Cactus Pear and Cochineal
RESISTANCE OF IN VITRO GROWN FORAGE CACTUS CLONES TO DACTYLOPIUS OPUNTIAE (HEMIPTERA: DACTYLOPIIDAE) |
| Authors: | D.M. Passos da Silva, L.M. Houllou-Kido, D. Cordeiro dos Santos, R. Gonçalves Ferreira, V. Felipe dos Santos, W. Melo Ferreira, M. Silva de Lima, H. Marinho Falcão, F. de Sena Tabosa |
| Keywords: | carmine cochineal, tissue culture, Nopalea cochenillifera, plague |
| Abstract:
The carmine cochineal is an important plague that attacks forage cactus plantations in Brazilian Northeast. Insect survival and development of carmine cochineal Dactylopius opuntiae (Hemiptera: Dactylopiidae) was studied in different in vitro micropropagated clones of forage cactus. In this experiment, the development of carmine cochineal colonies, originated from laboratory multiplied nymphs, was statistically evaluated as a randomized block design, with five treatments: “gigante”, “miúda”, “orelha de elefante mexicana”, “algerian” and “F-263” clones, with 12 repetitions. Each repetition consisted of one plant at six days of age. For the variance analysis, the data were transformed into square root of %+0.5. The plants, removed from culture medium, were transferred to 200 ml glass containers using filter paper. These plants were artificially infestated with 10 crawler nymphs which remained confined until their adult phase. It was observed variation of the resistance among clones when the Tukey test (P<0.05) for comparison of the averages was applied. No insect development was observed on “miúda” and “orelha de elefante mexicana” clones, suggesting a resistance of immunity type or antixenosis. The results indicate that in vitro micropropagated clones of forage cactus differ among themselves in terms of resistance of carmine cochineal attack. | |
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