TOBACCO (NICOTINE TOBACCO JUICE). 373 



Tobacco powder spread by the bellows on the insects is very 

 efficient, and in many cases it is more active than pyrethra powder, 



Haltica ampelophagus, Guer. (altise of the vine). — In the opinion 

 of d'Aurelles de Paladines tobacco juice of 3" B. black snuff mixed 

 at the rate of 12-15 per cent with Apt sulphur, a mixture of 1 per 

 cent of rich juice, 1 per cent of petroleum, and 1 per cent of soap forms 

 an insecticide which destroys the altise of the vine. Von Schilling 

 regards tobacco infusion as the most efficient medium against the altise 

 if the spraying be renewed after each rain. Thiele observes that these 

 preparations have no action on the altise unless the insects are touched 

 by the liquid ; the insecticide coatings which cover the leaves after 

 treatment do not remove the altise, hence the necessity of multiplying 

 the treatments to obtain a favourable result. 



Altise of the Gardens.— When young plants commence to shoot 

 up they are copiously watered and then wood sawdust strongly soaked 

 in dilute tobacco juice is spread over the whole of the seedlings. 



Criocerls Asparayi, L. (the asparagus beetle). — Blin recommends 

 as very energetic a mixture of 10 lb. of tobacco juice infused in 30 

 gallons of boiling watei', and 2^ lb. of soft soap ; 66 gallons of this 

 mixture suffice for 2000 asparagus plants. This treatment completely 

 destroys the larvae. 



Criocerls ?iielanopa, L. (crioceris of cereals). — Sajo recommends 

 tobacco juice, used as spray on infested fields. The following are the 

 results of a trial made with a solution of 20 lb. of tobacco juice, testing 

 14-5 per cent of nicotine in 10-6 gallons of water. 



TABLE LXXXII. — Action of Tobacco Juice on Crioceris of Cereals. 



Barleji in Lb. 

 Plot treated with 154 gallons of this solution . . 199 



Untreated plot 78-1 



Immune plot ......... 21o-() 



There is no doubt of the good effect of this treatment. The operation 

 is best done at the moment the larvae are hatched. At that time 

 the field is sprayed in the direction of its width, then it is sprayed in the 

 direction of its length. 



Ehynchites FragarUe. — This insect which cuts the strawberry 

 leaves is overcome by tobacco juice (0*5 B.), (Ernest). 



Zabrus gihhus (carabe bossu), (cereal zabrus). — Three per cent of 

 Hungarian tobacco extract in 100 litres of water are perfectly capable, 

 according to Sajo and Naszay, of destroying this insect and its larvae 

 in wheat fields. The treatment is applied in the month of April ; the 

 stimulating effect is at once seen in the improvement in the growth 

 of the plant. 



Cassida viridis (artichoke tortoise beetle). — Its larva gnaws the 

 leaves of the artichoke. Debray destroys it by tobacco infusion. 



Sitones lineatus, L. (the striped pea weevil). — Noel advises tobacco 

 juice 0"5° B., and containing 1 per cent of soft soap. 



Ocneria dispar (bombyx dispar, gipsy moth). — Berelse destroyed in 

 five days 100 per cent of the caterpillars of this butterfly with a 5 per 



