MATTING ARRANGED TO KEEP OFF RAIN OR HAIL.
The greatest havoc, however, appears to be wrought by the pyrale, a species of caterpillar, which feeds on the young leaves, flowers, and shoots until the vine is left completely bare. The larva of this insect, after passing the winter either in the crevices of the stakes or in the cracks in the bark of the vine, emerges in the spring, devours leaves, buds, and shoots indifferently, and eventually becomes transformed into a small yellow-and-brown butterfly, which deposits its eggs amongst the bunches of grapes in July. Between 1850 and 1860 the vineyards of Ay were devastated by the pyrale, which, like the locusts of Scripture, spared no green thing; and all the efforts made to rid them of this scourge proved ineffectual until the wet and cold weather of 1860 put a stop to the insect’s ravages.[408] More recently it was discovered that its attacks could be checked by sulphurous acid, or by scalding the stakes and the vine-stocks with boiling water during the winter. Nevertheless, it appeared impossible to check its destructiveness at Ay, where it made its reappearance in 1879, and caused an immense amount of damage. On this occasion an ingenious gentleman, M. Testulat Gaspar, was seized with the idea of combating the pyrale by means of the electric light. His theory was, that on a powerful light being exhibited in a central position at midnight amongst the vineyards, with a number of tin reflectors distributed in every direction around, the butterflies, roused from slumber, would wing their way in myriads towards the latter, when their flight could be arrested by sheets of muslin stretched between poles, smeared with honey and baited with a dash of Champagne liqueur. The theory was put to the test in August 1879, amongst the vineyards between Dizy and Ay, where the pyrale was committing the greatest ravages. The light was turned on, and the butterflies rose ‘in millions;’ but they failed to flock to the reflectors, and the honey-smeared muslin proved quite useless to secure the few which came in contact with it.
THE PYRALE.