There are three species of the currant-borer, and their presence is indicated by yellow foliage and shrivelling fruit. The only remedy is to cut out and burn the affected stems. These pests are not often sufficiently numerous to do much harm.
I earnestly urge that virulent poisons like Paris green, London purple, etc., never be used on fruit or edible vegetables. There cannot be safety in this course. I never heard of any one that was injured by white hellebore, used as I have directed; and I have found that if the worms were kept off until the fruit began to ripen, the danger was practically over. If I had to use hellebore after the fruit was fit to use, I should first kill the worms, and then cleanse the bushes thoroughly by spraying them with clean water.
In treating the two remaining small fruits, blackberries and strawberries, we pass wholly out of the shade and away from trees. Sunshine and open ground are now required. Another important difference can also be mentioned, reversing former experience. America is the home of these fruits. The wild species of the blackberry abroad has never, as far as I can learn, been developed into varieties worthy of cultivation; and before importations from North and South America began, the only strawberry of Europe was the Alpine, with its slight variations, and the musky Hautbois.
I do not know whether any of our fine varieties of blackberries are cultivated abroad, but I am perfectly certain that they are worthy of the slight attention required to raise them in perfection here.
Like the blackcaps, all our best varieties are the spontaneous products of Nature, first discovered growing wild, and transferred to the garden. The blackberry is a fruit that takes kindly to cultivation, and improves under it.