vi PREFACE. 
German Cockroach, Phyllodromia Germanica; and the Caddis 
Worms, or larve of the Trichopterous Caddis Flies. 
Of other injurious crop infestations, Kelworms were especially 
noticeable in connection with Tulip-root, Stem-sick Clover, and 
also (as mentioned above) with Onion-sickness; Wood Lice, 
Centipedes and Julus Worms, and Slugs, also played their parts; 
as likewise Acari in the form of the Red Spider at Gooseberry ; 
and the Black Currant Gall Mite (Phytoptus ribis), which has 
now become a very widespread and serious trouble to growers. 
Some very useful points regarding prevention and remedy 
(which will be found noted with the respective infestations) have 
been brought forward. One of these is the destruction of Pear 
Gnat Midge maggots (see p. 120) in the ground by dressings of 
kainite or nitrate of soda, this to such an extent that only a 
small proportion of the larvee survived. In itself a cure for Pear 
Cecidomyia maggot is not of very widespread use in this country ; 
but I believe we might work the principle of application very 
usefully forward by throwing chemical manures of the above 
nature on the ground where there are grubs or caterpillars 
(larve) just below the surface in a condition in which they 
cannot get away from the action of what to them is poison. 
When the larve are just turning to chrysalis state they cannot 
creep down deeper in the soil (out of the way of applications), 
and I think the plan would be well worth trying to clear infesta- 
tions of Sawfly maggots from below Gooseberry bushes and Pear 
trees; and it might be worth while (as an experiment) to try the 
effect on ground (or on grass, to as heavy an extent as was 
thought safe) beneath trees where Winter Moth caterpillars were 
known to have gone down. 
The observation, p. 89, of the Winter Moths not crossing a 
dressing of freshly-slaked lime, though the ground was ‘‘ literally 
alive’’ with them, is also well worth notice. 
Besides consulting communications as to successive infesta- 
tions, there has also been frequent enquiry as to the best means 
of obtaining serviceable entomological information, and requests 
for leaflets, especially on Warble Fly, Daddy Longlegs, and 
Wireworm, of which I keep a good supply in hand; and there 
has also been a good deal of Colonial communication as to 
injurious insects or allied pests. 
