Similar Questions

Toni
09:11AM, 22 Oct 2009
Answer: Hardenbergia can develop leaf spots which can b...
Category: Diseases
Expert
09:11AM, 22 Oct 2009
Liz
06:42PM, 28 Oct 2009
Answer: Dear Liz, Without a great deal more information...
Category: Diseases
Expert
06:42PM, 28 Oct 2009
Tammy
Medium_photo I've got these white spots on the back of my lettuce leaves and they're killing my plant. What is it?

Pretty sure they're not eggs. It looks like a fungal infection, but I can't be sure. I've uploaded a photo, is there anything I can treat it with?

Submitted: 12:54PM, 30 May 2012
Answer: Hi Tammy,
It is difficult to identify the cause of the lesions. Is the lettuce leaf skelotonised? If it is then the cause is probably caterpillars and you could apply Yates Caterpillar Killer Dipel. Are the symptoms all over the leaves or only on the outer leaves? If it is only on the outer leaf remove the leaf and place in the rubbish bin.

There would also appear to be evidence of white fly which could be treated with Nature’s Way Insect and Mite Killer (Natrasoap) but care must be taken as lettuce leaves are quite soft and easily damaged by spray.
Try to water around the plant rather than over the foliage.

Lettuce is also susceptible to downy mildew and the outer leaves should be removed. Ensure good spacing between the plants to minimize the problem. Normally spraying is not required but Leaf Curl Copper Fungicide, which contains copper oxychloride, can be used if the problem is serious. Spray when the disease first appears and then again 10 days later.

Category: Diseases
Tags: lettuce
Answered: 01:25PM, 30 May 2012

Comments

This area is for general comments from members of the public. Some questions or comments may not receive a reply from Yates. For specific gardening advice visit Ask an expert Alternatively you may wish to contact us.