Oak Apple

oak apple

Greater stitchwort
Greater stitchwort

It’s as if someone’s thrown a switch and we’re suddenly in the peak of springtime. In the last two weeks we’ve had a covering of gravel-sized hailstones and just last weekend the crowds were braving wintery showers to cheer on the Tour de Yorkshire cyclists. This morning as we follow the towpath to the Navigation Inn (which is still struggling to get fully up and running after the December floods) orange tipwe’ve got peacock butterflies and orange tips flying alongside us. Greater stitchwort, dandelion and green alkanet are freshly in flower.

A canal side oak is bursting into leaf and amongst the catkins on its branches we spot a few oak apples, made by the gall wasp Biorhiza pallida. The wingless unisexual generation of this gall wasp has spent the winter developing in galls on the roots of the tree then emerged and climbed the trunk to lay its eggs on the buds. The buds develop into the reddish spongy oak apples and from these the bisexual generation will emerge.


blue butterflyA blue butterfly (holly or small blue?) flies up from the rock face which creates a south-facing sun trap at Addingford Steps. On the River Calder near the old Horbury Bridge woollen mills two male goosanders are diving.

lapwingA lapwing swoops over the Strands where I drew in the aftermath of the winter floods. There’s a warbler in the tall grasses. monocularFrom it’s song Barbara thinks it’s a sedge warbler, from it’s appearance – not streaky – I took it to be a reed warbler. But I’m struggling to get a decent view with my little monocular: I must bring binoculars next time!

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