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Cotton mealybug, Phenacoccus solenopsis Tinsley (Hemiptera: Pseudococcidae) is a serious pest of cotton, tomato, eggplant etc. The species is polyphagous and invasive and can attack many other economic crops. A field trial was carried out to study the effect of seasonal temperature and relative humidity on the mean number and infestation level of cotton mealybug on Tomato in Gezira State, Sudan . Tomato seedlings were transplanted into the field on 1 January and 1 August, 2016, respectively. Cultural practices were conducted as recommended by the ARC, Sudan. The infestation level and mean numbers of mealybug and were closely observed through weekly counts in both seasons. Temperature and relative humidity during the study period were provided by ARC, Meteorological Station. The results showed that the infestation level (50–90) and the mean number of cotton mealybug (0-15 insect/15cm) were lower on tomato in January where the temperature ranged between 20 oc and 25oc and the (RH) ranged between 30% and 40 %. The infestation level (80%) and the mean number of cotton mealybug (40–100 insects/15cm) were higher on tomato in March where the temperature ranged between 25oc and 35oc and the (RH) ranged between 20% and 30 %. The results show ed that the infestation level (60–80) and the mean number of cotton mealybug (0-5 insect/15cm) were lower on tomato in August where the temperature ranged between 25 oc and 30oc and the (RH) ranged between 70% and 80 %.The infestation level (80-100%) and the mean number of cotton mealybug (40–60 insects/15cm) were higher on tomato in from September to November where the temperature ranged between 35oc and 40oc and the (RH) ranged between 40% and 60 %. It concluded that the seasonal temperature and relative humi dity could influence the infestation of cotton mealybug on tomato crop. Keywords— cotton mealybug, Phenacoccus solenopsis (Tinsley), Relative humidity, Temerature, Tomato.

international journal of horticulture, agriculture and food science

The Effect of Seasonal Temperature and Relative Humidity on the Infestation of Cotton Mealybug, Phenacoccus solenopsis Tinsley, on Tomato in Gezira State, Sudan (2016)