562 APPENDIX B 



alive in Hobart on account of the heat of the weather, and he also found 

 that they were terrible cannibals. But this is probably true of all crus- 

 taceans when confined in a limited space without food. The remainder 

 carried over to Dunedin remarkably well. But the mortality continued, 

 though they were placed in a tank continuously supplied with fresh running 

 water. All were dead within 16 days after arrival, the last eight of them 

 being badly infested with fungus (Saprolegnia or Achlya). 



In a communication to me in June, 1920, Mr Cheeseman adds the 

 following notes of introduced species : 



SAPINDACES 

 p. 390 Acer pseudo-platanus, Linn. 



Spreading in many localities in the neighbourhood of plantations. 



p. 408 Hawthorn (Crateegus oxyacantha) 



In the latter part of 1919 it was found that certain orchards in the 

 Auckland district were infected with the bacterial disease known as Fire- 

 blight (Bacillus amylivorus, Trev.). It is supposed that the disease was 

 introduced from the Western States of America, and distributed by means 

 of nursery stock from Auckland. An examination in 1920 showed that 

 the infected area ranged from Warkworth in the north to Kihikihi in the 

 south. The Waikato was the most widely infected district; there was a 

 considerable spread of the trouble in Tauranga, but the orchards in the 

 Thames district were free from it. Drastic restrictive measures were adopted 

 by the Agricultural Department, and apparently in some areas, i.e. Wark- 

 worth and Silverdale, the disease was stamped out. As tested in the 

 departmental laboratories the plants affected in New Zealand belong to the 

 genera Pyrus (pears, apples, and quinces) and Crateegus (Hawthorn). Pear 

 trees have suffered most, but the Department has come to the conclusion 

 that the disease cannot be coped with in any district as long as the common 

 Hawthorn (C. oxyacantha) is allowed to remain in evidence. Therefore at 

 the end of last session of Parliament (1920) an Amendment of the Noxious 

 Weeds Act 1908 was passed declaring Hawthorn a noxious weed. Clause 3 

 of this Act states that a special order may be made by any local authority 

 limiting the operation of the Act to a part only of any district. Clause 4 

 reads as follows: "The planting of hawthorn is hereby prohibited, and 

 every person commits an offence against the principal Act who propagates 

 hawthorn in any manner, or who does any act with intent to propagate 

 hawthorn, or who sells any seeds, plants, or cuttings of hawthorn." 



p. 409 ROSACES 



Spireea Lindleyana 



Found near Arrowtown, where it was first observed by the Pastoral 

 Runs Commission in May, 1920. 



p. 409 SAXIFRAGES 



Escallonia macrantha 

 Common on banks in and near Wellington. 



