ISHS Acta Horticulturae 231: II International Symposium on Mango
INTRA-TREE DISTRIBUTION OF EGGS AND DIAPUSING ADULTS OF THE STONE WEEVIL |
| Authors: | R.P. Shukla, P.L. Tandon, C.L. Suman |
| Abstract:
Intra-tree distribution of the eggs of mango stone weevil, Sternochetus mangiferae (Fabr.) on Baganpalli cultivar of mango revealed that the highest number of eggs/fruits were deposited on the fruits in the lower region of tree, that is, upto two metres height. With the increase in tree height, the eggs depositon on fruits decreases. Statistically no difference was observed in average number of eggs/fruit deposited in North, South, East and West directional quadrats. Within fruit, the highest number of eggs were deposited in sinus region in comparison to area around pedicle or rest of fruit area. The linear regression line of the eggs population in sinus region on fruit with total egg population, that is, Y = 0.5175 + 0.6972 X explained 82 per cent variation of the total population within fruit. Adult weevils emerged fruits during June-July, undergo facultative diapause till next season in March. During diapause, they hide in cracks and crevices in the tree trunk. The distribution studies revealed that 87.8 per cent adult weevils hibernate at 0–2 metres height of tree trunk followed by 7.42 per cent at 2–4 metres and only 4.78 per cent above 4 metres height. | |
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