THE EFFECTS OF STORAGE CONDITIONS ON SUBSEQUENT HATCHING OF GLOBODERA ROSTOCHIENSIS

Z. Muhammad

Abstract


Three-year old cysts of Globodera rostochiensis were stored under dry, wet and humid conditions at 5, 10, 15, 20 and 25 ºC far periods ranging from two to twelve months. At two, four, six, eight, ten and twelve months intervals, eggs were hatched at 20 ºC (for those cysts stored at 5, 10, 15 and 25 ºC) and 25 ºC (for cysts stored at 20 ºC). The highest emergence occurred in cysts stored wet at 15 ºC and above, while the least emergence occurred in cysts stored dry at 10 ad 15 ºC. It is suggested that emergence is influenced by storage humidity regimes and to a lesser extent by storage temperatures and time periods. These findings corroborate the suggestion that G. rostochiensis shows preference far wet conditions with medium temperatures, which are near to conditions occurring in nature during spring and early summer in the United kingdom.

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